Bloggers' Search for Anonymity

The BBC puts the case for the untraceable voice.
The Internet has given the individual unprecedented power to reach out to millions but some governments are cautious, even hostile, to giving their citizens free access to ideas they deem too democratic and dangerous.

This very useful article explains how to remain undetected online. The information is aimed at people in countries like Tunisia where criticising the government may be akin to signing your death warrant -- it's certainly going to give you a hard time when you're caught.
I'm very much in favour of people being able to say "I think the government in my country stinks" or even to criticise the actions of individual people. Without dissidents it would be a lot harder to have democratic progress. But, and I have to admit to a big "BUT" here -- the same technique that hides a dissident from a vengeful government can be used to hide a cyber-criminal.

Anyone got any ideas about achieving the first without allowing the second?