Hey look, it's not easy being a parent. But at some point we inherit the responsibilities in our own lives and must look at and correct what we see that is wrong. The mind that is a blank slate at birth, receives input each year of life. The input the child receives over time dictates the roads that are chosen. Many serial killers end up to be children that were from abusive families.
Pain shows itself eventually one way or another.
It's never too late for anybody to overcome their problems, if they seek out help. Once we acknowledge the problem, we then can begin the process of healing and recovery.