Some may think as you do but you are not correct in this. Some kids are just self centered self serving self righteous dipp-****s. Good family's can have bad kids. I have seen it and experienced some of these things myself. No parent is perfect. There is not always a traceable path to mis-direction. My wife has 3 sisters and a brother. One of the absolute best family's I have ever known. The oldest sister went off the rails a long time ago and despite all of our best efforts she chose to orbit another planet other than this one. My only brother took the same path. Total losers despite every effort from good parents.
We had a case in our church a few years back where the husband and wife were a great couple. Nice, easy going, and everyone liked them. Yet, the 16 year old daughter conspired with her boyfriend to kill both parents so she could "run away" with him. The boy actually tried to shoot the parents but the father was able to get to his own .38 and managed to kill the boy. It was tragic all around.