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For #1: You could actually separate out regions with lead poisoning, control for it, and get a better picture of gun violence. You can then focus on eliminating lead as a proxy mechanism for lowering gun violence (and all violence).
For #2: If the majority of men who are violent (or any race or culture deemed "genetically more violent" bullshit) are actually just poisoned with lead, then it could be lead affects baby boys more than girls (which is common with lots of toxins).
Another way to look at a lot of this is: Tons of social, psychological, and political policies and beliefs could simply be because tons of people were poisoned with lead. Prisons, laws, numbers of officers, therapies, racist/sexist beliefs, all need to be reevaluated.
Sorry I have one more, but this one is potentially *super* unpopular: It looks like damage to the ACC also causes things like "alien hand syndrome" and OCD, which could explain people who desperately need to cut off their arm to feel "right". Could cause body dysmorphia too.
Combine OCD and 'alien hand syndrome' with damage of self-awareness, and an ability to correct errors in visual perception, and damage to the ACC could be the cause of people not feeling like they belong in their own body.
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