the problem is simply we could never all agree on what goes; I hate child porn and the drones that create/sell/distribute/view it, BUT they might equally hate metal, or Spiderman or Sponge Bob. So who chooses? Put destructive technology against chat rooms in the hands of the Christian Right, sake of argument, and we'd all end with Shared files choc full of the wisdom of Pat Robertson and chatrooms extolling the virtues of abstinence, so like others have rightly pointed out, we cannot be in the business of saying this is tolerated and this is not, that is not the role of WinMX users.
Like the lady the other day who found child porn on her boyfriend's (now ex-boyfriend?!) PC, just report the loonies to the people charged with prosecuting them and leave it alone otherwise. The other thing we can do (which I do a lot) is Browse people coming into my queue, & anyone with child porn or Nazi sh*t gets lashed off and goes into the Ignore list. That way, I exercise my choice, others can choose to tolerate if they wish, and above all the system don't turn into a tool of oppression.