I don't know where, but I recall reading years ago that a person requires 2 to 3 shots for their sense of direction to narrow the focus to the correct area relative to where they are when they hear a gun being fired.
Killing people like this guy has, even hitting people (in the few people who have survived) is an amazing if despicable display of marksmanship.
I don't own a gun, I've never fired one, I'd probably drop any gun (or fall on my butt) when a recoil hit me. I know one person who owned a crossbow. Guns were illegal, but crossbows weren't covered by the laws, and I admire him for that.
I sometimes have violent emotions but I don't (usually) act on them. But this cold-blooded killer, I could shoot or stab this fucker with nothing on my conscience. I don't think this is a violent emotion, just a wish for justice and will someone stop this guy!? For crap's sake, a school bus driver? A kid? A mom?
I dearly hope this guy is killed in a shootout with police, without having to try him, convict him, and execute him (ten or twenty years in the future.) OK call me cynical. Anyone who shoots him in cold blood I hope will not be charged, and if charged with murder, will hopefully be aquitted.