The modern view of criminal justice, broadly, is that public concern with morality or expediency decrees expiation for the violation of a norm; this concern finds expression in the infliction of punishment on the evil doer by agents of the state, the evil doer, however, enjoying the protection of a regular procedure.
I fear no man, no beast or evil, brother.
In this life, we have to make many choices. Some are very important choices. Some are not. Many of our choices are between good and evil. The choices we make, however, determine to a large extent our happiness or our unhappiness, because we have to live with the consequences of our choices.
The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it.
It's obviously a lot harder to try and be a good guy than it is to be a bad guy. The world is a fundamentally evil place, it seems like. So in order to be a good person, you have to fight temptation and vice.