That's definitely a legitimate point, but not the main point IMHO. The main point is that Tor makes zero effort to clean up the problem and uses the legitimate

That's definitely a legitimate point, but not the main point IMHO. The main point is that Tor makes zero effort to clean up the problem and uses the legitimate Tor users as helpless, scapegoated victims and a bullying tactic. "But think of the oppressed users!" Sorry, not buying it. The blacklisted IP lifetime problem is real though. It's a problem I've had to raise several times with our product and network teams. People would see an abusive IP and just ban it...without a TTL or lifetime. This really upset me as they seemed to think that was OK not just for the time being, but that it was good enough. When I describe IPv6 to them, their faces just melt as it sinks in that they can't just keep banning IP's and must do something higher up the stack to detect and block fraud.