the bad outcomes don't need to be prohibited under these bills. it's already illegal to, for example, distribute pornography to minors. which i think is something that a reasonable parent would have a problem with.

but if there is no way to determine who is a minor and who isn't, then it's impossible to determine the difference between "willful negligence" and regular old negligence and enforce any consequences for breaking that law. age verification laws are about mechanisms to make other, already existing laws actually enforceable.