Interesting history lesson but doesn't explain why a few people do mass killings. Obviously mental illness is the core but still, most mentally ill people, don't kill others. The Chicago experience, where guns are outlawed, produces over 600 killings a year, from guns. Gun control seems pretty ineffective. In the most recent case, the dark state failed, gun controls were in place but both the air force and the mental hospital failed to report appropriately. Instead of political solutions, we need a deeper analysis of how to identify and stop the few.