A lot of hoarding could be due to people wanting to make money during the breakout. Why go out and get toilet paper if you can buy it from your neighbour?
Many people use toilet paper like facial tissues. Some feel it's cleaner than regular facial tissues. Others might want to make paper mache. And maybe some odd person might use them as pillows.
You might complain about people who buy up all the of toilet paper, creating a supply problem for everyone else.
But ironically, those people who stocked up on 100 rolls have no supply issue.