I think is the scanning for profit and destroying them in the process that angries people.
If they we’re just kept where they were you can always say they’ll eventually be scanned or have that potential.
I do believe the issue is a bit overblown but the core of it sounds reasonable to me.
Shouldn't they be allowed to do whatever they want with the copy they bought, and so legally own? Isn't that the entire purpose behind "copy right"?
It's destroying books that angers people in general.
Never mind that it's the 200th copy of some 1950's romance novel that nobody will ever care about, every time a library prunes its collection there is outrage.