In many RPGs you can choose your alignment and gather a party accordingly. And then you role-play.
I never choose an evil path if I can help it. Even in BG2 I had Edwin and Korgan in my party only temporarily (to experience their quests) though I heard people say having them in the party is hilarious.
There is no way I would abuse innocent NPCs, rob poor farmers or kill children for any reason or reward. I find it difficult to enjoy evil choices.
Most of my characters usually end up sugar-coated saintly heroes.
I wonder
what more fun is for you: role-playing good, evil or neutral? What is your preference?