I am 100% certain that not everyone in the country shares your exact same reading habits of reading only technical books and philosophy, so you should have stated for me pickings are slim.
Therein lies the mindset of a limited mind, circumscribed by ignorance.
Once upon a time, libraries catered to all levels of knowlege competence.
You think the Library of Alexandria limited itself to Gay, Lesbian, Bisexual, Transgender, and I-don't-know-what studies?
Not so. I mentioned my reading preferences as an example. That's what I spend 95% of my reading time on. I just don't have time for everything. I'm interested in everything from history to biology and have perused dozens of sections in our local libraries and other libraries when I travel. They seem to contain mostly donated books. The kind that people didn't want to clutter up their own bookshelf with, most certainly not scholarly works.
This hasn't always been the case. 40 years ago, I grew up in a town of 40,000. Had the best little library I've every seen. Went back recently and it like everything else in this country is in an academic decline.