This is an attempt by Republican Gov. Bill Lee to indoctrinate the young people of his state with right wing ideology, by limiting the flow of information that is not consistent with the right wing way of thinking, the picture that you posted is an example how this was once achieved, and you can look at history for the results.
While I tend to agree, it's also backlash against the Authoritarian Left seeking to jam certain ideas down the throats of Americans. Both sides have become authoritarian, anti-American assholes seeking to impose their views and only their views on Americans.
Two wrongs never make a right.
