Personally I see nothing wrong with straight up gambling platforms and to the extent that I do, it's an easy choice for me to ignore them.  I also don't believe that Bitcoinica either helped or hurt the Bitcoin economy very much.  If I were putting a huge amount of effort into developing the platform and it was used in this manner, however, I am sure I would feel a bit demoralized and like I was wasting my time.  If that is a factor in Zhou Tong and Gavin's comments, I could certainly relate to that.