Then why are we taking their opinion over our own?
Typically, when people cite something like that, they defer to an expert in that field. In this case, maybe an anthropologist? There's nothing in the training to be a physicist that prepares them to understand the early stages of civilizations forming, let alone is longevity.
You put it on a hook? The shower rod is pretty good for me when I hang it to dry. Move the curtain out of the way and spread it out and it gets pretty good airing out. When I lived in places without a shower rod or a shared bathroom I'd hang it on a door.