I still do not understand the grocery/necessity hoarding. I never saw a report out of Wuhan that said there was any supply issue. They were just restricted of when they could go out to the store.
A psychologist appeared on local TV and opined that it may be a way for people to feel in control. They can't do anything about schools, etc closing, or even truly protecting their family against an unseen foe, but they can at least try to make sure they have enough food, etc to take care of their families.