Random background research
Well, it's easier to dismiss someone who's not like you. Of course, they're wrong, of course, they're evil. But someone who thinks the way you think, who believes what you believe, but uses these talents and thoughts in an evil way… well, that's a harder villain to dismiss. We have a natural affinity for those who are like us - who think like us, act like us. Looking in the mirror and facing a foe who reflects their qualities, will force the heroine to confront the dark inside themselves.
- From here
