Why are mass shootings becoming more common (since the 80s)?

[Shankapotomus]

12. Right, and I don't challenge that

But the stats for MASS slayings, which more closely mimic the kind of behaviors imperialist armies have imposed on and subjected weaker native populations to, have gone up. We see mass slayings repeatedly in the history of imperialism and manifest destiny. In others words, the coping strategy when dealing with whole cultures one doesn't understand or despises is to try to wipe them out. One of the traits these shooters typically have in common is not fitting in with or rejecting or being rejected by the larger culture.