> For people who support this kind of ban

I support the ability of local jurisdictions to create laws that are intended to benefit it's citizens. If that means banning a particular new and pernicious development in their borders, then yes, of course I support that.

> would support a similar ban on new factories for, say, car parts.

Has anyone actually done that?

Do you support a ban on tobacco? If yes, then what's different about your desire for this type of ban?