Saureco, man... it's the internet. Get used to it!
All your points are inarguable as far as I'm concerned, but we're talking about people here. There's simply more ijots in this world than there are rational, thinking people. It's worse, of cource, when you are dealing with something that has so much cross market appeal. This forum naturally attracks some very smart people, but also some barely literate knuckle draggers and not just a few kids.
Besides that, sometimes it's fun to just be goofy.
All said and done, this is still one of the better game related forums I've ever seen.
Seriously, you wanna see bad? Check this out: http://www.tribalwar.com/forums/forumdisplay.php?f=1
Yup, they have BF2 forums too.