I think a user that uses deleted files to hide information could be classified as a power user: give them an option to enable unsecure file deletes if they real

I think a user that uses deleted files to hide information could be classified as a power user: give them an option to enable unsecure file deletes if they really want to. That seems like a crazily tiny use case. For the average user, though, I'd rather make them more secure by default.