Just to be clear, I don't think anyone is proposing that, especially me. The fact that someone was abused as a child does not, in of itself, as you point out, result in violent behavior. However, when there are a series of highly stressful things happening to them as adults, and when you have family members calling the authorities and asking for help, and when you can observe changes in their behavior that indicate they are in a crisis, only THEN does it make sense to have an intervention. Again, it is a whole constellation of events or pattern of events which include abusive histories. And, to be clear, an intervention is a mental/emotional health process, not a criminal or prosecutorial process. And, an intervention has a limited effect and is subject to judicial review. A person who is at risk can be in custody for a short period of time for them to be evaluated and a formal recommendation made. The problem is that the rules that health professionals and LEO's operate under interfere with their ability to do anything even when everybody agrees this person is in crisis and needs help. That is not the same thing as trying to stop someone from doing something they might do.
Imagine for a moment that it was your adult son or daughter who was threatening to commit suicide, but when the authorities came they couldn't take any actions. But YOU know your child is in crisis and you want to do something to help them, but the system won't let you help them, or won't provide the help. That is the situation we are in today in most States. We had a Virginia State Legislator, a very popular one, attacked by his son and then his son committed suicide because the Virginia Mental Health System couldn't find him a psychiatric bed, and once the time expired for his custody they released him. The Father was nearly murdered by his own son because no one was able to help him....and that was when the SON thought he needed to be hospitalized. That is how badly the system is broken.
So, neither I, nor anyone else is supporting what you suggest...that would be nuts...sorry couldn't resist the pun.
Cody