As far as I know I didn't read this anywhere, I came up with it, and it sums up my point of view nicely:
"What a person believes is not as important as why they believe it."
No one will blame you for making a good decision that resulted in a bad outcome. You simply had incomplete information, and did the best you could with what you had.
People probably will (and should) blame you for making bad decisions though, regardless of whether it turned out alright or not.
I look around and I see a lot of people standing for a lot of different things they believe are important, but rarely, if at all, do I see a person give importance to the methodology used to arrive at their position.