It seems to me that the most dangerous thing in the last 100 years or so, ranked by loss of human life, is leftist governments. There is a very good reason that leftist governments do not want their subjects (future victims) to be armed.
Yes... and the reason is because it really really REALLY sucks when your intended victims can and will shoot back ...
Just saying, all kinda sorta hypothetical-like an’ stuff...as research for a fictional novel...
The numbers on that: https://www.hawaii.edu/powerkills/20TH.HTM