The problem is that a lot of the criticism against SABR people regarding the human element is based on extremely small sample sizes of how a player performs in 'clutch situations'. I think most SABR people would acknowledge that there is a psychological element to the game, as there is in any sport (witness the Texas meltdown in the 7th inning). However, I think it is very hard to reach conclusions about a player's psychological ability in these situations based on the information which is provided. You also see good players with a statistical track record of success in these situations being criticized because they fail in one or two key situations in the season and fall short of the Barry Bonds superman standard, who was probably the most unplayable player in the history of the game.