U.S. murder rate is way higher than other developed countries. Our non-gun murder rate is normal, but our gun-murder rate is huge.
Much gun violence is not rational. It’s not clearly motivated by money or lack of fear of the justice system. It’s just two guys getting into an argument who fail to solve it peacefully and someone pulls a gun.
Parts of certain cities are overwhelmed with crime, so children are often left to fend for themselves. This develops a culture and an intuitive sense that if I don’t respond to provocation with violence, I will be taken advantage of. This leads people to instinctively respond to perceived provocation with deadly force.
Although gang violence is a big problem, most shootings are not gang related.