Heh- when I first read the title of the post, at first I thought you might be referring to all the garbage MS Front Page puts in HTML documents when it writes them.
I think something that hasn't been brought up, though, is that there's a difference between written and verbal communication--if somebody is talking with me and swears, I can choose to ignore it, and that's the end. I find written cursing much more offensive, though, especially as Moonie noted on a more professional website such as this. In written form, it's not just over and done with, it's there on the screen to stay. And so I ask... why is it necessary? Sure, it can be edited by the moderators to read fun characters that otherwise only get used in comic strips and pattern matching, but what's the point? Is it necessary? Save those characters for regexes!