Just like Rooney should have been sent off against Wigan? Don't you think that was also a potential game changer? You got to roll with the punches. You WILL get bad decisions against you as you get good ones, and in United's case the good decisions far out weigh the bad, so I wouldn't complain.
The "handball" incident when Terry's arm was right against his side and the ball struck it? Look up the rule of handballs.
Zhirkov penalty was soft, but definitely a penalty.
I hardly see what the fuss is all about.