Earlier quoted context omitted.
Impressums cannot be required in the US, once again thanks to that pesky First Amendment. You may be mixing us up with Germany. Mandates on how speech must be structured are a violation of freedom of speech, Constitutionally speaking. “Redressing a concrete dysfunction” does not appear in the Constitution as an exemption to guaranteed rights, as far as I am aware. The proper remedy for this kind of problem is an Amen…
Regulations on speaking to children have ample precident. We rate movies and age-gate admittance, we don't allow children into liquor stores, strip clubs, or adult bookstores. None of those things violate the First Amendment.
“We” (as in the US government) do not do this. There is not, nor can there be, a law requiring such rating.
> we don't allow children into liquor stores, strip clubs, or adult bookstores
These are physical stores/venues, not written speech. “We” do not restrict authors from writing adult books that may or may not be seen by children, nor do we require that the books are labeled as such.
If you want to restrict speech, pass an amendment. That is the allowable path.