[burnished]

Their findings are that the book bannings are really for the purpose of

Virtue signal by people in positions of institutional power to voting-age parents interested in school choice, parental rights, and wedge social issues to the detriment of non-voting age students Reject and exclude topics that challenge a perceived status quo from the public discourse (e.g. non-heteronormativity, non-cis identity, non-traditional gender roles, and non-Judeo-Christian books are targeted

and that

Fortunately, book bans are widely unpopular amongst parents across the ideological spectrum.

It would make sense though given that reading can be transformative for some people but realistically I think most folks are worried about everyday problems like teen pregnancy and substance abuse or getting into fights - and to your point if they are off reading unbearable moral philosophy in some library they aren't out screwing around.