Evil can be defined in many ways, ask yourself, is the child who kills a spider evil? Even if he does it out of fear? Is the man who runs over an innocent woman evil? Even if it is an accident? If that driver owns up to his crime, is he still evil? If he runs away from the crime due to fear, is he more evil than the driver who owned up to the crime?
There are lots of ways a person can be defined as "evil", but as you can see, it seems most of them are judged and governed by one main factor; fear.
Fear has little to do with evil. Evil is allowed to truly flourish when there is no fear. Man is at his most wicked then.
Adolf Hitler enacted Race Laws at Nuremberg is the early 30's and according to those Laws anyone who wasn't a true German had no recourse for any crime perpetrated against him by a German. It was therefore not illegal under German Law to beat a Jew, steal his property or take his life. Evil ran unfettered through Germany, it stripped stark-bollock-naked and joined the Army, then it killed, raped, plundered and gorged itself on human misery free from the fear of consequence...
...until Germany lost the war that is. Then evil was captured, interrogated, prosecuted and hanged for running amok by good men and true. Or, maybe evil just changed uniforms and again practiced its madness free from sanction.