Back story

I just figured out Damien's background story! It's quite dark, that's about all I'll say.

You can read about it below if you'd like but it's massive spoilers

Damien's Backstory:
Damien has clearly had other people he has tried to "save" (aka other victims). When he was a child, one of his parents was very abusive towards Damien. That parent then killed him/her-self. Damien thought that if only he could of "saved" them, then maybe he would of been loved by them. This is why he feels like he has to save somebody in order for them to love him. Everybody he's tried to save would not allow him to save them and If he can't save them then they might as well join his family.