December 14, 2012. Newtown, Connecticut. Adam Lanza murdered his mother in her bed and then drove her car to the local elementary school, where he embarked on a shooting spree that left 20 first-grade students and 6 educators dead.
Add to your list of causal factors the myth of redemptive violence grounded in Christendom (not authentic Christianity). But yes, start with your closest space. Thanks for your witness.
"Political gridlock and a flawed campaign finance system and toxic masculinity and nationalism and the NRA are all connected in ways that make the system feel unchangeable and unconquerable."
Toxic masculinity a/k/a "Mars rules" over-identifies with guns to compensate for feelings of misanthropy, powerlessness, and the wounded (as in distorted) sense of self-worth.