ya and that pattern isn't changed by people whining for bannings of usernames or IP. The same pattern occurs.
<ban ip>
<get new dial in addres>
<ban ip>
<use new proxy>
<flag user>
<new user account created>
See? If you care deeply about never seeing annoying or offensive material, I'm going to suggest you just cancel your internet access now. You might also consider not leaving your house, and turn off the TV, god knows what kind of crap might come in through that.
The reason I responded to this thread saying "yeah so?" when someone posted something that a great many people might not expect or want to see on this site is that I can't control it. I can't control it at all, not by banning IP, not by flagging user. It's life, it's the universe, people say **** you might not agree with, and people post things you might find exciting disgusting pornographic, or whatever. So what?
It takes more effort for someone to post crap than it does for the community to get rid of it. In cases of spammage, I even have a few admin tools which make it reall easy to get rid of. Don't sweat it. Don't worry about it, and don't by any means get in a stink when someone posts **** to a message board that you don't think is right. This is the Internet - you're less likely to meet offensive people randomly walking though New York.