If I was more paranoid, I'd start thinking the ban is to make it easier to spy on us by limiting our choices to a few domestic vendors who can be coerced by regulatory capture and "for the kids" political rhetoric.
Having said that, once someone explains to them in words of one syllable that they've just banned the sale of all of the devices that make the Internet go for the entire electoral base, they'll TACO so fast it'll make your head spin.