who came up with that anyway?

Toilet paper? The Chinese invented it. Eeeeeeverything is their fault.

That's some post-apocalypse type of stuff though, and at that point I'd probably have other worries, too, such as other people killing me.

Don't forget that in almost every movie and tv-series about post apocalypse world, there will be cults. At least in North America. Someone will demand you to join their cult. And perhaps that includes killing people. You or someone else. Perhaps now there is a toilet paper cult slowly rising it's head.

People are crazy.