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actually fix the problems that cause people to turn to violence and crimeThese are not mutually exclusive propositions. As I mentioned in my comment, there are two concerns here:
1. Reducing the number of violent antisocial people by reducing the number of people who are exposed to childhood circumstances that tend to produce them. This is complicated and entails dictating to parents how they raise their children to a much higher degree than most people are comfortable, and than our society's values permit.
2. Dealing with the ones who already exist. This is policing and justice.
> the people you label "antisocial" these days are people who have been left behind by society
> It's the economy, stupid
If only it were this simple. I'm referring to people who haven't been correctly socialized in their early childhood. Toddlers are all violent, self centered, assholes by adult standards. They learn not to be through appropriate socialization with their peers, through play. Children who are not given this developmental opportunity past a particular age tend to exhibit traits that strongly correlate with violence in early adulthood. This is exacerbated by numerous domestic factors, most importantly the absence of two parents in the household and the presence of violent antisocial adults in the household (not household income).
We can observe these same traits and behaviours develop in our ape relatives for the same reasons. We're not that different.
> I think those people are a much smaller percentage of people who commit crimes than you think
This just isn't true - this small percentage of people are the serial criminals responsible for most of the real danger in our society - shootings, armed home invasions, armed robberies, etc. These sorts of crimes are largely not committed by people who are "down and out", but by people who are in many ways fundamentally different from the average person. I'm not talking about petty theft here.
This can be most clearly illustrated by the phenomenon of college campus rape. The rapes themselves are committed by a tiny fraction of repeat offenders. "Teach men not to rape" doesn't work on them. They're just not like most people, mostly as a result of some combination of tragic childhood circumstances and poor socialization (again, not household wealth). The best solution is to identify these people and imprison them as efficiently as possible. To enact this solution effectively, the people we entrust with it need power.