So I guess Microsoft should be able to block any other browser because Chrome might crash and someone could says "Windows Vista sucks" (which it does but that's a whole 'nother story)

Beyond that, if that scenario does happen Apple gets to tell it's customers "Look, Palm messed up your data which is why you should use geniune Apple hardware" and they win a monsterous victory. Palm corrupting iTunes data would be the greatest thing to ever happen to Apple. So the idea that Apple is blocking the Pre because of that doesn't hold much weight.