The only thing I can add is that the pollution aspect very much depends on where you are in the world. If that place has a working system of garbage collection and management, then it is very unlikely that a plastic bag ends up in the oceans. So maybe we should spend the money that plastic bans cost on helping poorer places improving their waste management to pollute less.
In any case, I'll happily continue to buy plastic bags, reuse them a few times before they become garbage bags. And pay the counterproductive tax that would rather have me buy something worse.