Earlier quoted context omitted.
> This young man appears to be able to go from 0 to 100 very quickly with little self control. Maybe this is Captain Obvious speaking, but poor impulse control seems like the single common denominator among a whole load of social ills that consistently land people in trouble (legal, financial, social, across lots of spectrums). From crimes of opportunity/passion, to short-tempers and "blowing up" on people in public…
Why do you assume it's the upbringing? It could be any kind of brain injury, in utero or post birth, heavy metal poisoning or simply genetic. This kind of behavior does not strike me as learned but rather as a deficiency. On top of that the defendant looks rather dumb.
On the flip side, self-control, impulse control, being able to manage your emotions with a toolbox: these are skills that are learned, honed, and mastered. Sure, many people learn them through other means than from their parents, often as a survival necessity in their environments, but I don't think that e.g. the people who fly off the handle and get into a bar fight when someone's hitting on their girlfriend, are doing so because of heavy metal poisoning or genetics.