Why Toilet Paper?

When people are told something dangerous is coming, but all you need to do is wash your hands, the action doesn't seem proportionate to the threat. The novel coronavirus is engendering a sort of survivalist psychology, where we must live as much as possible at home and thus must 'stock up' on essentials, and that certainly includes toilet paper. After all, if we run out of [toilet paper], what do we replace it with?

Stephen Taylor, The Psychology of Pandemics