You never have to feel a particular way. If anyone says you have to feel bad, or that you shouldn't feel bad if you do, they're wrong. Not how feelings work. Some people feel better knowing that their abusers are shit because their folks are shit, and it had very little to do with you, other than your convenience as a victim when they wanted to hurt someone. But what you feel just is.

I try to just look at what I'm feeling, and accept it, without judgement. Don't turn away, but don't dwell. It makes it easier to decide reasonable action later. Not detached from emotion (impossible) but understanding it as a part and not the entirety of behavior, where right and wrong start to come into play.