Do plastic bag bans help spread disease?

[RC]

5. Those 'reusable bags' get set on the floor, food check out counters, kitchen counters, car trunks.

Set on seats with their dog in cars. Some even let their kids/cats play with them between uses. Most people make no attempt to clean them reusable bags. I have seen some used at grocery stores that were absolutely filthy. They were set on the checkout counter to be fill, contaminating the food and bags of the customers after them.
Some reusable bags cannot simply be washed. The fall apart after one or a few washings.
We reuse the plastic bags we get. Those with rips or holes, we put into the trash. I find them very handy and convenient to carry stuff in. If the contents are given to someone else, we do not need to worry about getting the bag back. Just hand it over and be done with it.
Dirty reusable bags have been an obvious problem from the beginning. Someone just now is starting to figure it out?