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Libraries are under continual space pressure. Books come in, the buildings stay the same size. Thus, "weeding."

And of course libraries have succumbed to a kind of identity panic, "Who are we in the Age of Google?" Everything is online, so ... let's just pitch this stuff to make room.

Make room for what? Again the identity panic: maybe we are a community center, so let's set aside space for this and that and the other thing, which is still more pressure on the extant catalog.

And so those big shelves of microfilm just sit there, haven't been looked at in ages, might as well pitch 'em. It's all online now. Now. Maybe not later.

I worked in an academic library for a long time. These problems are endemic.