I'm sorry, but what I have to say to that is simple this; Parent should teach their children better, teach them virtues, how the world works, protect them from the horrors that exists. Love and nurture them. Not wash their hands and shrug and expect some lousy politicians to protect their children. Geez fuck.
Forgive me for being passionate. But this isn't the way to solve the problem.
> protect their children
Going "entrance forbidden to the libraries and bookstores: they are full of bad texts (and there are people scribbling dumb harmful things on the billboards there)" is not "protecting children".
(With reference to YouTube, chiefly, but not necessarily excluding other repositories. And not to mention the actual intention to block access to encyclopedias.)