Can default trust members put negs on somebody and then tell them to pay up to remove it? Obviously the community will revolt against such an activity,
Pay up to whom? if you could ask them to pay to the forum I don't see how that could result in a community revolting, would you consider paying the fee for evil IPs as extortion? or maybe paying for copper membership is also an extortion attempt?
But because forum owners charge those fees nobody says anything.
Stop trolling us for one unhandled report, I've got 27 unhandled reports but you don't see me trolling people for them.
if it was done in real life, sure. The capabilities of police to unmask this individual on the internet, who probably doesn't even live in the same country... they'd subpoena BitcoinTalk for information requests. There's a lot of barriers there, and I wouldn't want the police knocking down the door of a forum I like a lot, and has provided a lot for me and for many others. But if the forum isn't thwarting provable criminal activity, what has it become? What will the community turn into? 
