Mankind, I suppose, is designed to run on - to be motivated by - temptation. If progress is a virtue then this is our greatest gift. (For what is curiosity if not intellectual temptation? And what progress is there without curiosity?) On the other hand, can you call such a profound weakness a gift, or is it a design flaw? Is temptation itself at fault for man's woes, or is it simply the lack of judgement in response to temptation? In other words, who is to blame? Mankind, or a bad designer?