Perhaps we should focus more on judging the outcomes of people's actions instead of their intent.

I believe most people are incapable of recognizing well-intentioned but bad actions when they agree with the intentions. Even when you don't agree with the intentions, it's can still be hard to spot without the benefit of hindsight.

Should you fault someone for being the change they want to see in the world?

"Fault" is quite a slippery word to use in this context. As it means both a failing of character and responsibility for wrongdoing.

Obviously with the second definition it's easy to fault someone when you see their actions as wrongdoing.

With the first it's mixed, and I suspect that's the one you mean. Someone who is "being the change they want to see in the world" is seen as virtuous. But when that virtuous person is also too headstrong to see, acknowledge, and correct the negatives of their plans when they encounter well-articulated resistance? Yes, I would very much fault that person.