Any crime that involves deliberately harming others without necessity. Stealing food from the supermarket to live is not evil. Breaking into a house and ransacking the place is evil.
When I was in high school a "transient" came into the grocery store where I worked. He took a cart, walked around the store and picked out bread, coldcuts, mustard and a pint of milk. He pushed the cart into the back of the store and made himself a sandwich and had the milk with it. I found him just as he was finishing. "Are you going to call the cops?" "Nah, I'd do the same if I was hungry." "Please, call them it, it's going to be cold tonight and I want a warm place to sleep." I obliged him since he asked so nice. I hope he made it down to Florida eventually.