What about we block tor, and have an appeal system, with a committee that you appeal to, to be allowed to make an account and use tor. Of course, you would be at a much higher risk of being blocked, even accidently. But, I see no serious abuse of tor, that you can't do with an isp proxy (AOL et al), or that goofy-one-IP-address-for-all-of-Serbia-thing.
And, Tim is correct about tor's security. No anonymity service is completely secure, never will be. And unfortunately goofy people continue to suppress free thought. :(