No, I think what they want is not to have the rest of us have to jump through hoops (and sacrifice privacy) to achieve the same thing. Some of us don't have kids (or live in a household with any), so passing a law that potentially limits our internet access to solve a "problem" that already is dubious is ridiculous.
Fair enough! I misunderstood your previous comment as implying that measures like this were needed due to the unlikelihood of parents enforcing this. (There's probably a joke somewhere in here about "parent" comments as well, but I'm not clever enough to figure it out at the moment).