Good quote from John Gilmore on privacy:
Society tolerates all different kinds of behaviour -- differences in religion, differences in political opinions, races, etc. But if your differences aren't accepted by the government or by other parts of society, you can still be tolerated if they simply don't know that you are different.
You could probably call this the William S Burroughs test. Does a system allow someone who looks like a gentleman and who has (a habit / extreme thoughts / etc.) to get on with their life?