Originally Posted by Val
It also conveniently places blame on the guy who failed when the outcome may have been beyond his control (because he didn't believe and he didn't try hard enough).

Originally Posted by mindset book, page 47
Question: With all your belief in effort, are you saying that when people fail, it's always their fault - they didn't try hard enough?

No! It's true that effort is crucial - no one can succeed for long without it - but it's certainly not the only thing. People have different resources and opportunities. For example, people with money (or rich parents) have a safety net. They can take more risks and keep going longer until they succeed.
It seems that all things being equal, a growth mindset tends to take a person further than a fixed mindset. One's mindset is a factor which is under their control.