Most American voters find it acceptable to keep voting for a huge military buildup and having troops and weapons sent abroud to occupy and slaughter people, mostly brown people.
This stuff has a way of finding its way back home, as in the saying: if you live by the sword you will die by the sword.
Drug prohibition is also a component of the violence as a large number of homicides are done by gang members engaged in the drug trade.
Creating a war on guns is horrific to think about as the gangs will turn to gunrunning along with the illegal drugs, and instead of a safe traceable transaction with a regulated gun dealer, people will buy their guns from some illicit back alley gun dealer.
None of these policies address the inherent violence that these acts are a symptom of.