I understand what you're saying, and it sounds like you have been very blessed to not face any of these situations.
I'm only speaking of myself and not anyone else, because everyone's situation is different, but I grew up in a very conservative, judgmental church atmosphere. Any time something went wrong, it was always seen as being the fault of the parents or people involved -- there was never the slightest hint of acknowledgment or compassion over the fact that life can go very wrong, despite our best and most prayerful efforts.
So I grew up in the mind frame of basically seeing people's problems as being the result of their own bad choices or lack of willingness to do something about it -- and then God started putting me smack dab into the middle of situations I couldn't control, or in contact with people who had tried their best, but things had gone terribly wrong. Needless to say, it changed my own mind very quickly.
In the case of this family that I spoke about, there were several other dynamics going on, some of which I won't mention out of privacy and respect. But when I was talking to the father about this situation, he mentioned that this particular child had always been headstrong, never listening to advice, and was impulsive, and rebellious, in contrast to a sibling close in age who was pretty much the opposite, even from the time they were young. Part of it all this was also that there had been a remarriage in the family that the rebellious son had not wanted to happen and he remained bitter about it, rebelling at every turn because he blamed his parents for ruining their family.
The father also had a job in which he was working up to 100 hours a week, so I'm sure this affected some of what was going on at home and what was or was not being monitored. The remarriage had caused a situation in which this son was exposed to a relative he wanted nothing to do with (for good reasons all their own,) and so he spent as much time away from home as possible, thus falling into bad company.
My heart aches for all people who have started out doing the best they knew to do, but things have gone horribly wrong, and all they are clinging to now are prayers and the promises of God when this life ends.