So these assholes are still hoarding it. I don't get it.
Monkey see, monkey do; do not engage brain, do not pass Go.
All the TP is missing so people who have a perfectly adequate supply still get more because they believe the absence suggests scarcity, which makes TP scarce, which means that the next guy sees the empty shelves and thinks ... repeat
ad nauseam.
Edited to add: It can even affect the sane and rational among us. I've got at least a month's worth of TP, perhaps two - bought before the hoarding started. Even I am beginning to think, "You know, if I see a pack of our usual stuff perhaps I ought to get some, just in case the craziness continues" and if I do yield to that impulse I'll perpetuate the situation. Considering that I am demonstrably more rational than 99% of the rest of humanity it's easy to see how it snowballs.