Some of them supported them because they were pressured into it. Grocery bans of bags and payment etc. are a PITA for customers. No business in it's right mind would force that on their customer unless they were required to. Passing the cost on to their customer is not an issue. Supporting laws requiring payment etc. are cost benefit analysis. Is it worth fighting the bad PR etc or go along. But obviously they wouldn't have provided the bags in the first place if it was not a competitive benefit to them.