Because you shouldn't get behind a thing that shouldn't exists. Technical solutions to societal problems are and will always be naught and fraught with unnecessary jump roping. In this case, the content itself isn't dangerous, what is dangerous is consuming it without the correct context, ie. education.

They don't care about education, they don't even care about consumption of content. They just want a Trojan Horse ("it's for the safety of our children!") in order to accustom people to censorship.