Probably because its an US site. Its not allowed to swear on US telly as well, right?
You can swear all over the place if you like over here. Well, as long as its funny.
Heres an interview with Nikki Six and Tommy Lee in a german show. The words on his hands fick dich means fuk you:
http://www.youtube.com/watch?v=rP5oURPnUAo