I wish the MC would stop judging everyone. It's such a childish thing to do. Constantly thinking if someone's 'good', or 'evil' never helps with anything, it just oversimplifies and over complicates at the same time. Not worth it.
Could it be that a monster's latched onto the pain he felt like in witcher 3 where that guy killed his brother and it fed on his guilt and started making him go crazy.