It's time for those of us who believe in the rule of law to put a stop to this. I don't suggest making Tor illegal - enforcing such a ban would require truly scary violations of liberty. But what we can do is establish a social norm of treating Tor users like the criminals they are. Don't accept any HTTP requests from known Tor exit nodes, and look twice at a website operator who accepts them - if you can find a similar website that blocks Tor, use them instead.