Stop politicalizing my answers.
Homeless drug user has a gun and it gets fired, killing a woman.
He get acquitted on a murder charge.
He should have been charged with involuntary manslaughter.
Applying your train of thought to this scenario, a homeless drug user is a scumbag, and this along with the fact that he has a gun ensured that that woman got killed.
Homelessness and drug abuse and having a gun ensure that something violent will happen.
This holds as much water as your previous assertion.