Or you could, you know, enact harsh penalties on car manufacturers for having security that makes IoT devices look good. Just a thought

Maybe just ban car theft instead since clearly banning these items fixes the problem

You’d think car manufacturers could include an option for an old school lock type that can only be unlocked when physically inserting and twisting a key.

Nope

So now only criminals will be able to steal peoples cars. Well done.

They wont even be banned (which would be stupid) Its on the owner to proof they have it for legitimate reasons. The end result will mean the devices will be more hidden in everyday seeming devices. And if they do eventually ban them fully that legal local technological knowledge will be dragging behind criminal innovation.

You want these devices out there to increase awareness of their existence and to pressure manufacturer to make their devices more safe.

Example: Remember how Tesla can remote (un)lock cars? Exploit waiting to happen and the potential ban on encryption is going to make it so much worse.

Ostrich politics.