That’s an interesting idea. I can see local businesses having a whinge about it for a couple reasons: 1) people less likely to buy snacks/drinks on the go and 2) the business now has to deal with lots of extra rubbish that used to go in the public bins outside. Was there any push back? People were a bit whingey about the plastic bag ban here at first but I think most people have accepted it now (although I do forget my reusable bags on an annoyingly regular basis).

why would a good scientist stop researching?

Probably when you start to wonder if all your research is for nothing since nobody seems interested in enacting policy grounded in science.