Oh I didn't mean to say a shredder not destroying information was common sense. Maybe I just didn't like this particular example too much because I think even f

Oh I didn't mean to say a shredder not destroying information was common sense. Maybe I just didn't like this particular example too much because I think even for non-physicists it's still imaginable someone could – in theory – piece together the shredded paper again. Anyway, I agree with your overall point.