I agree the love for a child can never be totally extinguished. I always think back to when my kids were 4 or 5 years old. The good times we shared.
Thankfully my kids never got into much trouble. One got caught drinking beer with friends when he was 15. Cops brought him home about 11pm. Considering what he could have done, my wife & I got off pretty lucky.
Disowning a troubled adult child wouldn’t be easy. No one can just turn off the love a parent feels. However, having a child commit a serious crime like murder or rape has to be a parents worst nightmare.