I've mellowed with age. Twenty years ago I was where many people seem to be now - people get what they deserve for not making the right choices, bad situations are entirely of their own making and the rest of us are only responding to their provocations, etc. However, I never believed the notion that what people are is entirely a result of "nurture" and choice. Biology and particularly "brain chemistry" isn't a single setting, and birth is a lottery, not a choice. Some people start with shitty lives and sometimes things never really get better for them, and it's not entirely of their doing. Escalation generally only happens if all parties involved participate.
With the trend to restorative justice, lighter sentences, letting frustrated protestors and even mobs work out their anger, etc, allowing situations with mentally ill or merely temporarily very angry people (ie. a protest or mob of "one") to escalate to the point of use of deadly force is an aberration which is due for correction. Probably our "best practices" right now are not the absolute "best practices". Yes, there are risks to having unbalanced people living freely among us, ranging from mere curmudgeons to genuine pyschopaths and sociopaths. We chose that risk. I express my criticism harshly because while harshness puts people on the defensive and is not generally persuasive, it also forces confrontation. Some will choose to defend status quo; some will re-examine the problem.