Yep. A much better way to alleviate shortages would be to suspend sales taxes.
It's the just-in-time nature of distribution. Demand doubles from "normal" and all of the sudden nothing is sitting on the shelf.
However, while no sales tax on hand sanitizers is hardly going to be of a measurable impact for an individual, when you're hoarding to squeeze people in crisis, no sales tax makes for a nice 'bulk discount'.