You are of course right that people don't care. That's not terribly surprising, because to most of them none of what we commentards would warn them about sounds like words in any language they speak. I've found it painfully obviously when talking to various members of my family about IoT things that they simply do not understand any of the things I'm telling them, and don't believe the things they do understand because "They wouldn't be allowed to sell this if that was true!"
I've had more than one family member tell me exactly that, and it really gets to me because that's exactly how this should work, but doesn't. There needs to be a law that says you - product vendor - are legally responsible for meeting these minimum security standards and if you don't you pay huge damages. People who are used to simple electronics that have a kite mark of some kind on them to prove that they're "safe" just assume that there's some equivalent for IoT devices, when in fact, there isn't. It's the only way that people who don't understand, and don't care to understand, the actual problem can be kept safe.
There's a reason that you find a little label saying "This device must not cause harmful interference" stuck on pretty much all electrical equipment these days. Someone had to legislate for that because until they did we had a bunch of cobbled together electronic crap out there that fucked up everyone's TV and radio signals as soon as it was turned on - but of course the people who bought it had no idea why and probably weren't even aware that it did. Legislation is the only answer here.