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Any person who has a conviction for domestic assualt isn't allowed to own any type of gun

Any person with TBI isn't allowed to own any type of gun

Any person with drug or alcohol addiction isn't allowed to own any type of gun

Those three things would cut down the numbers of these types of murders, which tend to be impulsive.

What percentage of gun murders are committed by people with TBI, domestic assault, or state-known drug or alcohol problems?

Mass shooters have a super high correlation with domestic abuse.

So do cops.

Also being raised by single mothers.

Each of these things is a much better predictor of violent behaviour than mental illness, which is the thing normally blamed.

I don't have a issue with the logic of your statements, however the implementation of them could be rather scary.

Who is to say what a alcohol addiction entails? etc. etc.

A litre of 40% ABV spirits per day, or equivalent. It's not that hard.

Which then means you would have to register to buy alcohol. :S