You’re not taking into consideration the entire environment/culture these students are in. They go to school in a district where a book can be banned/restricted across multiple schools because one parent complained. What kind of library succumbs to this minimal pressure? What kind of school? This is simply one example of a much larger problem for all the students in that area.
In other words, they have to be the kind of students who know they CAN request information that makes their parents squidgy, and know that it is possible to find that sort of info at their school library. Is that the sort of education they’re getting there? Probably not.