There was a lot of investigation into quake proofing buildings that sat on rubber that flexed with the movement, rather than being rigidly braced - not dis-similar to engine mounts, I suppose.
So ID might be onto something there, would allow for some movement but not to topple over
Two of my shelves (Hammer Lock) are bolted together in an L shape in an effort to try an prevent them toppling over - also in case kids decide they need to climb them to look at fish :-?