He is no pacifist in his personal matters: he has admitted to killing animals that went into his garden, and has defended eating companion animals, chalking it up to an cold emotionless facts over feeling decision. Perhaps this facts over feelings persona was a sham, a way to counterbalance his own emotional dumpster fire of a life he kept hidden offscreen, or the drugs finally took their toll on his brain, sending him spiraling Rekieta style, and he just snapped.
Surprising, but it was bound to happen eventually, given his drug use and spiral. Hopefully the victim was not hurt badly and distances themselves from this degenerate. I wonder if he will give up his guns or say he will try the "boating accident and his guns fell overboard" scenario he brought up in his previous videos.