Aim center mass. That is all.
The problem with this is availability of good vests by anyone. I'm sure any 'New Black Panthers' heading into the St Louis area to cause trouble should have laser sights printed to their noggins.
From the autopsy sketch, seems Wilson did aim center of mass. He also mispositioned his finger (fine motor skills are nonexistent in combat), placing the tip thereof on trigger such that it pushed the muzzle a bit left, as the horizontal grouping was quite tight but off-center, hitting the arm 4 times and drifting right as perp approached causing scale of error to decrease.
Joe Pags on WOAI yesterday afternoon was giving a retired LEO a ration for saying, “We’re trained to shoot to stop the threat, not to shoot to kill”. Pags was hard over that every LEO he’s ever talked to said they’re trained to shoot to kill. He apparently didn’t get that, although it might amount to the same thing (center mass), when the bad guy goes goes down and the threat’s ended, “shoot to kill” means you go over and pop him in the head. That’s murder. C’mon, Joe, you’re BETTER than that!