It's not bizarre. It's not just about moral principles, but also practical realities.
> Children and teenagers aren't stupid
TBH, I kinda think they are, and I'm not exempting my teenage self. They are definitely impulsive, impressionable, and prone to fads and groupthink.
Have you heard of the book "Lord of the Flies"? Interestingly, this particular book has also been subject to what you would call a ban, at least in one case in because it's "racist". [1]
> Children and teenagers aren't stupid: what you're proposing is replacing subjects that they're interested in with ones that you're interested in, with your interest being an ideological one.
I don't think any of the topics I came up with are more ideological than the ones I mentioned from the library collections. However, probably what you count as ideological is itself influenced by the ideological glasses one's wearing.
> I think it's worth taking a step back and considering whether you'd be a worse librarian than the ones that we have; the ones at hand can at least offer the sound justification that increasingly large numbers of students feel comfortable self-identifying as LGBTQ.
Me personally? Maybe, but I could make suggestions which are definitely an improvement, but I don't think enough high school librarians would consider doing it. An example would be not purchasing any books by Ibram X. Kendi.