For many decades, people have been mistakenly putting diesel fuel into their gasoline cars, yet we never outlawed diesel vehicles. You can only do so much to protect people without destroying their rights to their property.
Society didn't ban doing it, but put up barriers that help the average person from doing something dangerous.
I think the pumps still fit where I live, btw
Making the nozzle shapes incompatible is a smart solution, but in the US at least I'm pretty sure they're interchangeable.