My daughter gave me a book that she recently had to read in one of her college course; Learned Optimism. How to change your mind and your life.

I’m only a few pages in and I’m unsure of this book. It says “the optimists believe defeat is not their fault: circumstances, bad luck, or other people brought it about 😳

The way I’m interpreting this is that optimists are not responsible for their results. It through me for a loop. Now that I have been learning the model, I for sure done believe that. We are responsible for all our results, we create our results. Am I missing something? Am I over analyzing?