If people really want to read things like that, then the publicly funded local liberal should carry them.
In fact, many US public libraries already do carry such books. Here's a search for books by David Irving in the catalogue of Brooklyn Public Library. [1] He is often accused of being a Holocaust denier. [2]
[1]: https://www.bklynlibrary.org/search?search=david+irving
Do US libraries typically offer books that glorify 9/11? (I mean the second 9/11 of 2001, not the first of 1973.)
I don't know any such books. If you have a specific one in mind, I will check to see.
But they do carry 9/11 truther books [1], which often claim that it was "an inside job" or "a hoax" or something.
If Maus were rated according to TV standards, there's no way it'd get less than TV-14. Unless you think shows rated TV-14 can be kids' shows, I think that disqualifies it as a kids' book.
Are 14 year olds adults?
It was still in the library.
I don't know the titles of any such books to search for, but my local public library has several books by notorious holocaust denier David Irving. So probably they wouldn't have a problem with a pro-9/11 book either.
edit: I didn't read the thread carefully, looks like Cato already pointed this out.
[1]: https://en.m.wikipedia.org/wiki/The_Anarchist_Cookbook
[2]: https://browse.nypl.org/iii/encore/record/C__Rb21741991
The Anarchists Cookbook used to be found in libraries. I'd hope it still is, along with books on energetic backyard chemistry. Not a 100% match, but in the ballpark.
> photo books portraying motorcycle crash victims or war casualties?
Not sure about motorcycles, but I'm sure you can find war casualties. Napalm girl https://en.m.wikipedia.org/wiki/Phan_Thi_Kim_Phuc at the very least.
> Hard core rape pornography?
Libraries do not typically carry porn. In fact, that's part of what the detractors would say this is about - that the pro-trans books sometimes contain pornographic images. (Of course, no one cares about 50 Shades or bodice rippers...)
If you ever been to library, kids section is for elementary/middle school, but high schoolers absolutely do read adult section books