There is no warning that minecraft will delete (not even just recycle!) the files on uninstallation. It isn't a good idea that minecraft does so, so I didn't expect that Minecraft even would fathom to (losing worlds is much worse than losing out on some harddrive space that there is a good explanation for what's filling it up). The fact that I didn't expect it at all, means it is essentially the same as if minecraft would punch me in the face when playing. I had no suspicion to not reinstall the game right after, which was probably what overrode the files to where no recovery program found them. Programs like Word and Photoshop don't delete all user files on uninstalling!