You say these things as if it's something new and developing. You're also way overblowing the "scarcity" of physical media. When thousands if not hundreds of thousands of copies of books are printed, they're not "scarce" in the slightest. Even if print runs are declining, there is no shortage on paper product to go around and any OOP books are only OOP because of publisher's not wanting to print more at the time. And there's a reason ex-library books can only be listed as "Good" condition and less on Amazon Marketplace and are prohibited as being counted as "Collectible." Ex-library books have always been in not the best shape. It's not like there's a magical new increase in the frequency of damaged ex-library books.
If the only copy of a Bru Cap Omni at my local library looked like it was dropped off a 20 story building, I wouldn't care. It's not there to be a collectible. It's there to be read by the patrons of the library. As long as the pages were not significantly damaged and reading could be accomplished, then that's fine. Dust jackets and covers can be repaired and reinforced. Same with the bindings. What happens to the book or the condition of it after it's pulled from circulation is not really a concern of mine in the slightest.
And you can boil down uncaring library patrons and poor retailers both as "not giving a ****" but the causes of not giving a **** are not the same.