Both passed over intense opposition from the auto industry; almost all advertising in the lead up to the vote was in opposition.
But it passed in both cases because... it's common sense. If you buy a product, it's yours and you should be able to do what you want with it, whether that means modifying the hardware or running whatever software you want.
Yeah. I don't even understand why we have to argue in favor of stuff like this. Somehow we ended up living in such a fucked up world where the things we purchase don't actually belong to us and we actually have to fight tooth and nail to make it sane again.
Keep in mind that this doesn't mean you shouldn't own or repair your stuff, but there are significant differences between products, and those differences aren't always clear.