I did not view the video (maybe later when the household is awake), just commented. There are common threads in "drive by" and seemingly "random" shootings (drugs, love triangle, racism, rivalry, infamy, political statement, poverty, ignorance, emotion, etc.) and a Learning Curve, which is apparently too steep for the Kool Aid drinkers. IDK, perhaps the following remarks are not related to an "auto-fire" trigger mechanism or the OP, but rather random thoughts on a parallel track...
Without a doubt, Bad Guys with guns DO NOT CARE and make life miserable for the Kool-Aid drinking masses. For those law-abiding individuals who own guns, carry, conceal, believe in the RKBA, and herald the responsibility DEMANDED by the 2nd Amendment, ending the lives of Bad Guys with guns is a PERSONAL CHOICE (and random opportunity of proximity to circumstance) to be judged by 12 rather than buried by 6.
In some places (certainly not Democrat "Mind Control" places), that personal choice is PROTECTED under law in a narrow manner. "Eminent danger" and "threat of great bodily harm" will be 2nd guessed by 12 and doggedly prosecuted. Still, leaving the scum of the Earth to rot is considerably better than being in the ground.
In some instances, following a justifiable private citizen shoot, [Kyle Rittenhouse; Jack Wilson, West Freeway Church of Christ; George Zimmerman (arguably); etc.], the protagonist is praised - not that adulation is sought [George]. Certainly, not everyone is "happy" with the outcome [deceased's family, "they-was-raised-in-poor-and-unfortunate-circumstance" Kool Aid drinkers, rabid Prosecutors, Race Baiters, ignorant Useful Idiots, I could go on and on, etc.].
Does anyone "know" when and where lightning is going to strike - No. Do folks get pictures of lightning striking - Yes (infrequently).
Does anyone "know" when or where a random shooting is going to take place - No. Do law abiding, gun toting, private citizens cross paths with Bad Guys in the act - Yes (infrequently). Does the Media portray Good Guys with guns in a POSITIVE LIGHT - HELL NO! Where am I going with all of this - IDK...