Does use of swear words show lack of a decent vocabulary?

I'm bored, tired and have ear-ache.

Funny, because I always thought that forming generalised opinions about huge swathes of people based on a single, personal anecdote of a family member was an indication that a person was a complete and utter moron, devoid of valid opinions.

No, how can it possibly indicate a lack of vocabulary?

Nobody says the c word because they don't know other words for it. Everybody knows plenty of words for the c word, from the slang to the medical.

I can't think of a single situation where a person replaces an obscure word with a swear word because their vocabulary isn't large enough to encompass obscure words.

I swear a lot because of my culture, because of where I grew up. I grew up on a lower class estate in the east end of Glasgow - it's known as the murder capital of Europe. People just swear there, and as a result, so do I. But I'm not unintelligent or lacking a wide range of lexical choice. Quite the contrary.

I swear for the same reason that other people don't swear - because of where and how they were brought up. But where and how we are brought up does not place a definititive cap on our intelligence and vocabulary. This enables people like me to be both intelligent/well versed in the language, but also a prolific swearer.

Look up Billy Connolly or Stephen Fry on the issue. Both unfathomably intelligent men, both profuse swearers, and both with a very valid justification for it.

Anybody who thinks swearing is anything other than a set of valid words that some people use and some people don't is a moron.