Originally Posted by ThePhantasm
But see, there we are just circling back to the original problem under discussion. Blake is disillusioned with the system throughout the movie, enough to seek out and encourage a vigilante to take action, enough to question orders, etc. - until Gordon reveals HIS disillusionment with the system, at which point Blake gets all self-righteous and judgmental.
I disagree with you're point in the sense that you're simplifying the situation too much.
The point you are missing doesn't have anything to do with Blake's disillusionment with the system, but with Blake's sense of seeking justice, which is what he is ultimately concerned with throughout the film. That is why he is asking Batman for help, that is why he questions Foley's action.
When he discovers the lie about Dent, it turns the world on its head a bit for him. The people who he saw as the real crusaders for seeking truth and justice covered up the crimes of a multiple murderer, and used that injustice to their advantage. In a sense he saw them making a deal with the devil.