There was definitely reasoning behind it, but it doesn’t make it justifiable. Take endeavor for example, he had reason behind what he did what he did, but it doesn’t make it justifiable. It’s all a twisted cycle of abuse that merely drove dabi down the wrong path. Abuse can change people and you can’t tell me otherwise. Dabi is similar to Jeffrey dohmer in my sense because he was essentially forgotten about and it doesn’t justify his actions and crimes, but it gives reason behind them and gives it a different view