Never a fan of suggested "solutions" that are laughably implausible. Even if you support public canings for everyone ever caught dropping a plastic bag, can we not pretend that something like that could ever be implemented in the Western world? Plastic bag bans can.
I was referring to a legal solution to plastic bag littering, which is what "broken windows theory" refers to.
The differences in littering in, say, Japan, have nothing to do with legal differences, because they're cultural. Cultures differ, and they have benefits and downsides. Trying to implement a legal solution to bag littering in the US would work about as well as trying to implement a legal solution in India to get people to stay within their lane when they drive.