My brother was molested as a child and doesn’t want to press charges. I can’t live knowing the man just got away with it.

Sorry, this isn’t a very light hearted post.
My brother was molested as a toddler by a man my mum dated briefly after she left my dad. My brother’s mental health has always been rock bottom, and he exhibited signs of a sexually abused child throughout our childhood but I never had confirmation until recently, when he started having flashbacks of the abuse and who it was. I don’t know the exact details, and I don’t really want to know because I think I would kill the man, but he was only 1-2 years old so you can imagine.

My brother doesn’t want to report it because he doesn’t want to have to recount his trauma again and wants to just move on. But I can’t sleep at night knowing that this man was able to do something so disgusting at get away with it, and also that maybe he did it to other children. I don’t know if I have much faith in the legal system, but if I had an opportunity to ruin his life myself I would take it. He has ruined my brother’s life. He has complex PTSD, severe depression and anxiety and has tried to take his life on multiple occasions since the flashbacks started. If my brother succeeds, it’s on his back and I will hunt him down.

The only reason I haven’t already is because I only know his first name, and the fact that he was a pub landlord. I know the general area of where the pub was, but I don’t know which one exactly and if he still works there. This was 20 years ago now. My mum will know, but I also think she knew about the sexual abuse and I doubt she’d be any help. She’s a total POS, and that’s a whole other story, I’ve been no contact with her for over a decade.

How do I stop myself from going crazy trying to find this man?