I’ll start with: medical conditions, everyone would prefer to have an average well known and curable disease than a special case or a unique one
Shooting up a school is special and unique
Okay how about stealing road signs and putting them on different roads, in the wrong place?
The amount of chromosomes.
Camouflage.
Lots of people want to have or claim to have rare medical conditions. It gives then something to do/talk about.
Claim to have, sure. But actually have, probably few, at least until that have to start dealing with the condition.
Having a rule written about their actions, or a law named after them.
For the rules, they did something stupid and management wants it to not happen again. If a law, then they were the victim of something terrible.
(Slim chance it was heroic, or cool.)
I dunno, I’d be okay with a rule named after me, causing an otherwise benign item to be banned.