[kovidgoyal]

Let's see, [edited] you set your desktop as the calibre library. Then you ask calibre to delete that library. Then when it does that, you complain.

You're like the fool that shoots himself in the foot with a gun and then blames the gun manufacturer for not manufacturing a gun that can read your mind and so refuse to shoot your foot off.

EDIT: And not just that when you ask calibre to delete a library, a confirmation dialog pops up that says, and I quote, "All files from 'the library folder' will be permanently deleted. Are you sure?". And you chose to ignore that dialog.