I've never given credence to the "cursing == less articulate" either. It's knowing the impact dropping a curse can have to get people's attention. Plus, sometimes, people are just too dense to get how bothered you are, but drop a colorful phrase, and they tend to get the point. Like the George Carlin bit, take a word like "incredible" and it's a nice word. Stick fuck in the middle of it to make "infuckingcredible" and it's an even better word. Fanfuckingtastic > fantastic and is much more impactful than "most fantastic". Having said all of that, I have never told someone FU. That's my line.
well, people have misused grammar for ages <ducks>
Again though, that's the great thing about "swear" word. Shit can be good, shit can be bad, and shit can just be shit. Not being a grammarian, how many words other than curse words be a noun, verb and adjective all at the same time. buffalo comes to mind, but is just non-nonsensical when used.