that I agree with you, in the main.  Most people I've hung around with that curse a lot are pretty dumb.  Unfortunately, I don't think not cursing makes you any more inherently intelligent or at least educated.  I suppose it does give you a better chance at coming across that way, but in my personal experience, I don't see much of a correlation.

Anecdote: this year at college, I lived on the floor of my dorm for people that chose not to do drugs or alcohol in their rooms, or come back from wherever drunk or high.  You can guess what kind of people were on this floor, for the most part: mostly straight-edge, religious-conservative kids.  Very few of them swore with any frequency.  There were only two people on the floor that I felt were worth talking to or hanging out with at all, one of which was solidly in the majority of the straight-edge but just a really great and interesting guy.  The other was the only sailor-curser on the floor, a guy I'm rooming with next year.

I'm reading over what I just wrote, and I'm having difficulty condensing it into any kind of bullet point (maybe that proves your point?), but I think you get the point.  Cursing and having worth as a human being aren't mutually exclusive.

Regardless, I try not to curse much because, like I said, I basically agree with you.  I just really respect a lot of people, including both acquaintances and people I've never met, who like saying fuck.