Earlier quoted context omitted.
Your local library has age and ID requirements. Your local 'town square' has 'some rules'. Parents are entirely able to overcome any of this if they so choose - including feeding their kids alcohol, guns etc. - and so the freedom does materially exist. Social Media isn't a place for free expression - it's mostly toxic - like exposing your children to the most vile, inauthentic people. The more genteel places, frankly…
My local librarian did not restrict my books to the kids section when I was a kid. Also librarians have fought civil legal battles to keep reading activities anonymous. Libraries are unlike the restrictions and risks of the proposed legislation being discussed for social media
--> Your local library fought for your right to read literature of some kind.
---> They did not fight for your right to gang up on others and call them the n-word, to spread lies and slander about people, to harass children and expose them to creeps and pedophiles, to inundate children with hyper-targeted advertising, or 'Andrew Tate 'how to beat women' seminars'.
Nobody is pushing for a ban on social media so that the kids will be stopped from reading 'Judy Bloom' stories about a girl's 'first period'.
It's disingenuous to suggest that this has anything to do with the causes your librarians stand for.
Literally the opposite - your librarians are creating essentially 'safe spaces' for kids so they can read and be civil.