I'm with you on Green and I'd rather not see either the Cavs or the Warriors win it but I disagree with everything else, especially the idea that his move was cowardly. I really don't see the big deal with him choosing a team that had won a grand total of 1 championship in the past 41 years.
He liked the way the Warriors play the game and he wanted to get away from a franchise that continued to make moves motivated more by dollars than wins. Yes, the Warriors were championship contenders without him but once you know you want to go elsewhere, why would you rule out a team simply because they were already good?
I'm more disappointed by his willingness to play alongside a psycho like Green than I am that he was looking for a team to win it all with.