Throwing your parent in jail for abuse that happened several years ago

My baby daddy and I are not together but we have a great co-parenting relationship. He is 21 and I'm 19. Yesterday was a big day for him. He was severally abused by his mom. He ran away from home at 17. He found out months ago that you can report abuse you experienced as a minor whether that he physical or sexual until you are 45. He had video proof of child abuse he experienced and yesterday won his court case against his mom. She is getting 15 months in prison. I found out because he posted a picture on his story outside the court house about winning and saying he got justice for the little boy she broke. My parents have a different perspective on this and I have always respected my parents opinion but I just don't agree. They said that locking your mother away for something she did 4 years ago is a sign my baby daddy has not healed and that my baby daddy should focus more on healing. My baby daddy said he did what he did to stand up for kids who have been abused and parents thinking they got away with it just because the kid is no longer a child. And the evidence against her was awful. He has a video on his phone where his mom has kicked his tooth out and said she makes him do this and to blame himself. My parents think my baby daddy should have focused on healing instead of locking away his mother that he hasn't had contact with in 4 years. That he should have just stayed no contact and healed. I think it's good he did this. It teaches abusive parents that they can still be held accountable. Either way I'm proud of him. I was curious. On what other people think.