A lot of beginner/poor writers tend to overuse profanity because they believe it gives characters an 'edge' or achieves some sort of realism goal. I don't think a whole lot of people find swearing particularly edgy anymore -- maybe thirty years ago -- but swearing can obviously make a book more realistic. It would be weird having a couple of teenage boys say 'oh gosh darn it', right?
I tend to treat swear words a little bit like adverbs -- i.e. I reserve them only for when they are absolutely necessary. I think 'only when needed' is a pretty good perspective to have with ANY language, but given that most swear words are fairly ugly to most people and overuse can weaken effect, I think it's reasonable to take particular care not to overuse them. In YA it's particularly important to be careful with that stuff.
Maybe that's not a very fashionable opinion, I don't know. I may be in the minority: I find Samuel L Jackson -- a good actor -- extremely tiresome with his endless 'motherfuckers'. It hasn't been funny since 1985.
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