Attention is the way social primates measure status. It is highly rewarding because it causes the release of brain chemicals such as dopamine and endorphins. ↗
I sometimes find that playing the bad guy, or villains, or psychopaths tend to be much more psychologically rewarding. And you can really push it, you can push the limits, and get away with it. ↗
Acting is an art form and you want to take roles that are challenged and it's more of a challenge I think to play dark characters. Not that I want to always play those, but it is a challenge and challenges are rewarding and fun. ↗