[tivert]

> If people are destroying the last copy of something, copyright was probably involved.

I think you're trying to inject a copyright angle without any kind of evidence it's significant in this scenario. And it doesn't apply: https://guides.library.oregonstate.edu/copyright/libraries.

I think (at least when it comes to public libraries), there are also other factors at play. For instance: a frequent self-understanding that they're not an archive (which is only somewhat true), and a motivation to "serve their customers" by focusing on "popular" services, and a misunderstanding of what the internet is.

[roenxi]

And yet, by the magic of there being only one way it could happen, the day that someone destroys the last copy of the microfilm will be because copyright prevented the people who wanted from keeping a copy from doing so.

It isn't like there is any shortage of people thinking that sort of record is worth preserving. Lots of people do. There is a shortage of people legally aloud to make copies. Because, as mentioned, copyright.