There’s around ten people or so in my family, all on Dad’s side, who are sensitive to Tylenol. It causes pain in the right upper quadrant. Most are older, past 40, and have known about the problem for decades. Younger relatives take advice, not Tylenol, so nobody knows if they’re affected. I’m in that group, I’ve never used Tylenol.
He brought it to the college somehow without being caught.
That's the easy part. Nobody was looking for an assassin with a rifle.
Leaving the murder weapon with all the forensic evidence on/with it makes ZERO sense.
It makes perfect sense. After the shooting, the heat was on. Cops everywhere, looking for an assassin. Last thing he wanted was to be caught with a rifle. Better to hide it and come back later when things settled down.
This dude actually planned his crime, thought he'd get away with it. He was wrong, his planning wasn't nearly as good as he thought it was, but he did have a plan.
This crime was very different from, for example, the murderer who shot up kids at Annunciation Church/School. He had no real plan ... just go there, start shooting, and get killed by the cops.