Films nowadays don't tend to pull any punches when it comes to things like violence, sex, and yes, profanity. Any number of films in theaters right now contain various forms of profanity, whether it be racist, homophobic, or someone simply dropping an f-bomb here and there. But when is it appropriate (if ever) to use language widely considered derogatory and lowbrow in film? Here's my opinion:
When profanity adds to a film:
1) When used to establish character.
While there are dozens of ways to show a character is a rebel or a "bad-boy" type without resorting to profanity, a casual swear here and there early on can establish it relatively quickly, but that's only when not every character is doing it. Once every person on screen is throwing around profanity, it instantly loses any power or character building possibility it could have had.
If a character is supposed to be severely racist, not having them ever use a racial slur would actually take away from the fact they are supposed to be this offensive, abrasive person. The way I see it (and this may just be because I don't enjoy hearing swearing on a regular basis), swearing to build character should mostly be used to make the audience dislike the person or at least give them a bit of a disconnect from them.
2) When the situation warrants.
There is a scene in the film "Memento" between two characters: Leonard Shelby (a man with extreme short-term memory loss), and Natalie (a woman who, up to this point, we think is trying to help Leonard). The scene in the movie is the moment (SPOILER ALERT!) when we realize Natalie is using Leonard for her own means and has no real desire to help him find the man who killed his wife. In the shouting match that follows, fuck, shit, and cunt are used to excess, with Natalie revealing that she is going to use his disability for her own purposes, knowing that he won't remember ever having the conversation in a few minutes. While the vulgar use of these words can make the scene very uncomfortable, that's because it's supposed to be. The director (Christopher Nolan) wanted the audience to hate Natalie in this moment just as much as Leonard does so he used the strong language to his advantage, having her repeatedly insult and him and his dead wife until Leonard goes so far as to strike her. As the scene ends and Natalie storms out, we see the emotional anguish on Leonard's face and the exact moment when the verbal assault he just underwent is stricken from his memory. It's at this moment that Natalie walks back in the house, pretending everything is normal, and begins doing exactly what she told him she would: using him for his own needs.
This one scene needed to make the audience turn on a relatively likeable character, and the language is used to achieve that goal.
3) For comedic effect (but used wisely and rarely)
I'm not going to deny it: there are times when someone dropping an unexpected f-bomb is humorous, but it all depends on when, where, and why. I recently saw the movie "Super 8" about a group of young kids witnessing a train wreck and the chaos that follows as an inhuman creature escapes from one of the derailed cars. A few "shits" are sprinkled throughout the film but are (for the most part) used in appropriate situations full of action and near death experiences. Still going for a PG-13 rating, "fuck" is not heard until late in the film after the bus the kids were riding in is attacked, overturned, and nearly crushed by the beast. A pot-smoking teenager who had been helping them, drives up in his car and sees the kids all standing on the road, still in shock after the trauma they just went through. He gets out of the car and begins chatting with them casually then slowly notices the mashed bus lying sideways on the road. He pauses to take it all in and then says, "what the fuck?" It is the only f-bomb dropped in the movie and I feel it was a good decision on the writer's part to not throw it in during one of the many action sequences and to not have it said by one of the kids. It was a very basic and understandable use of profanity and it broke the tension the audience was feeling after the loud, violent, chaotic bus attack they'd just been put through.
When profanity detracts from a film:
1) When everyone uses it.
I saw the film "Kick-ass" not too long ago and, being a comic book geek, I was as excited as anyone to see a nerdy kid attempt to become a real life super hero. Not too far into the film, however, the main character Dave is hanging out with his buddies at a comic book store, discussing the possibility of an average person taking on a super hero's role. In this simple conversational scene, several f-bombs are dropped for no discernable reason. They're just chatting away about comics and superhero's but it's "effin' this" and "effin' that." It was at that moment, I started to dislike the film. We had barely started and already I felt disconnected to the main character and his friends because of the fact they couldn't put a simple sentence together without putting the word "fuck" between every other word. Now, I realize the film is based on a graphic novel and (to my understanding) profanity is used just as often in the comic, but it could at least be toned down for the general public, right? Several things are often lost in a book-to-film adaptation, so why not have some of the pointless swearing be written out of the script? As the film continues, this idea that everyone swears is taken to the next level as we meet "Hit-girl", a kid no more than maybe ten or eleven years old who fancies herself a super hero vigilante. To get this "tough girl" point across, she swears like a sailor non-stop, which I found very uncomfortable and unnecessary (especially since I felt it was supposed to be comedic relief).
If swearing is used far too often or by the wrong people, it will lose all meaning instantaneously and fade into the background of the dialogue. My rule of thumb: if the meaning and power of a statement doesn't change if you simply remove the profane word from it, it doesn't need to be there.
2) When a character we're supposed to like uses it in excess.
When did swearing become endearing? This next point connects pretty directly to my last one: if you want the audience to like and care about a character in your film, maybe they should be able to form a complete sentence without dropping some sort of swear word in amongst their dialogue. Let's look at one of the most likeable characters in cinema history. A man that people quote tirelessly and always have fond memories of when they first "met" him on the screen: Forrest Gump. First off, the film is not a children's movie. There is drug use and nudity etc. so it's not like the filmmakers felt they had to pull any punches in order to keep it from an "R" rating. So why doesn't Forrest swear as profusely as ever other movie character seems to do nowadays? Because it would have been ridiculously out of character. It would have caught the audience off guard if the famous quote had been, "my mama always said, 'life's like a box of fucking chocolates.'" It just wouldn't have made sense to the character. So why do I have this feeling that if "Forrest Gump" had been made nowadays, there is a much greater possibility that he would have sworn a number of times over the course of the film? Probably because the majority of Hollywood writers don't seem to know how to think about how a character talks as being a part of who the character is. It's almost like you could read any line from "Kick-ass" and find the same line said by a completely different character from the movie "Superbad" or "The Hangover." Dialogue just isn't distinct and varied as it used to be, and I think profanity plays a big role in that.
So that's my stance on swearing in film. I am not against the fact that it has its time and place, but I just feel that maybe people need to take a step back and find that line again. Profanity can be a powerful thing, used to show strong emotion and conviction. But, like anything, when it is overused, it gets tiresome very quickly.