you don't have to think of the mc as a self insert, besides the ruthless chapters aren't about hurting asterion, most of it is played from the perspective of good boi argos, and it contains some neat lore info that makes it interesting to check out.
I can't be a bad guy in any game unless involves dark magic. I was once a bad guy in fable 2 it made me very uncomfortable.
as i said, you don't have to think of mc as a self insert. it wouldn't be you