And there aren't evil governments. There are different kinds. Differences can go to that level where it contradicts our ideas about how humans should live. My favourite example is ancient Athens, the hyped democracy with slavery, aggressive wars, slave hunting as a sport, ignoring and sometimes killing "low quality" newborns and so on. When differences reach a certain level or/and the government can't take care of things reliably the inhabitants start revolting, nearby countries get angry at the government's actions and the government goes into history as evil. Hitler's dictatorship undeniably reached this level at a time but wasn't at that level when it started.
I thought that this quote by Ahriman was very insightful and interesting. The analogy here is a very good point. There have been many governments, states, organizations, etc which have done horrible things but have not been defined as evil by history. Many of those governments also have not started that way. No one says "I want to be an evil dictator when I grow up" yet we still have them - and most of them believe that what they are doing it right.
Right and wrong is very relative. So what characteristics determine whether a government or group will go down in history as evil or an example?