This is all dumb. If you're worried about kids surfing porn sites then the legal guardian should act accordingly. There are so many methods to blocking porn sites that it's almost hilarious. Web filtering; most ISPs are able to support website filtering on their supplied gateway or DNS. Parental controls on device; most devices come with opyional locks built-in at this point especially if it's aimed towards children.
Sure, it's not perfect but it's better than removing yet another layer of web anonymity. We see how well browser fingerprinting is going, let's not make it easier to track who is browsing where than it already is. But that's the real point behind these bills, isn't it?
Edit: I guess I was ranting mainly about the porn, but honestly, these are all things that parents should be aware of their children doing. If it's an awareness issue, then that should be the next step. The government going straight from "oh there's a problem" to "let's make it illegal" without trying to raise awareness is extremely heavy handed.