Yes, because its accurate.

Dahmer was a horrifying killer. He also had a functionally absentee father, and his mother was self-medicating to deal with her mental health issues and developed a substance abuse issue. He was left alone at home for long periods of time, making him both physically and socially isolated. His biggest connection with his dad was being interested in the anatomy of dead animals, and his dad showed him.how to bleach bones and overall encouraged it - but not really engaging further. In school his behavior was considered bizarre, heavily attentions seeking, began drinking in high school, etc...

Everyone around him failed him in some way, and he became an absolute monster.

It doesnt change the fact that he did horrible things. It doesnt mean he didnt become a monster.

Recognizing that trauma led to that, though, is a good thing. It means we can better identify, understand, and address earlier.

If we reworked the monsters experience, Frankensteins engagement with him, how he was presented to the townspeople and how they reacted to him, would he have turned out differently? I would say yes. And I think its important for us to recognize that.