ACCOUNTABILITY FOR CHILD MURDERS

Recently a Friend lost a member of their family to child abuse. In the research ive done these men and women who kill a child get on average 20 yrs. I find it heart wrenching that any child suffers.With laws the way they are now there is little to no accountability most of the cases i found had prior calls to department of social services. Mostof these deaths were preventable
In the states the death penalty is available why is not being used on the adults who commit such horrible acts against these babies. these abusers are not going to change and get better they will continue being aggressive and hurting others weaker then them. We have a responsibility not only to those babies who were killed but to the future children these abuser will come in contact with.When these people get parole who monitors them? Is it going to be like sex offend registery that has gave people a false sense of safety. Many children have lost their lives to already known sex offenders that were supposedly monitored example John Gardner. So again if we have the death penalty available why is it not being used to protect these children.