Maybe "Question about self-censorship" would have been a more-elegant title?

I'm just wondering why it is, on boards without language filters, some people will use naughty words, but then edit the words themselves, so that they're not as naughty anymore. You know what I mean, where "****" becomes "f#@k" or "bull****" becomes "bull****" or what have you.
And it's not just here that I've seen it, but other, filter-less boards as well. I'm just curious about why people do this. Do they not know that they can pretty much say whatever they want, within reason, without getting "in trouble?" Or is it maybe a more-personal thing, where they don't want to actually use the dirty word themselves, or they don't want others to see them using these words?
Help me understand, won't you?
Th@%ghts?