Look, when we built the Internet (back in the ARPA days), it was restricted to trusted players at military and research universities.
Then we let in the unwashed masses.
Then some morons decided to give Internet capability to every single device in the Internet of Things.
First principles, people:
Build one Internet based on IPv6sec for the trusted peers. The backbone.
Build a second Internet for the identified non-object computers based on IPv6sec. The unwashed masses. If parts misbehave, turn off their feeds until they fix them. Drought solves lots of problems.
Build a third Internet for the Internet of Things based on IPv6 and IPv4. Restrict the ports and traffic to essentials. So you can't play Disney in your car, too bad.