Others with the disease strongly recommend them.
While these are very visible events, do they actually have a significant contribution on the shortage compared to all the other shoppers having a slight increase in desire to buy toilet paper. It is possible even the visibility of the panic buyers loading up as much as possible has more of an impact than their actual purchase. Take someone who buys 8 of those mega packs. Plenty right. But the picture going around might convince hundreds that they should pick up a single pack when otherwise they would have waited until their existing stock was lower before restocking.
I'm guessing only someone with access to the actual store records would be able to pull a report to clarify one way or the other.