Not only is it difficult to get other people to change, it’s difficult to even impart new ideas to them. They first have to be willing to learn. Not only in theory, but also in practice. You can hand someone a new tool, but they might toss it aside. Even after you’ve done everything you can to convince them that they should use it.
We’re all stubborn like that, and not always on purpose—we have many blind spots. If you’ve become aware of even one of your blind spots you should automatically assume you have more. Thinking that you’ve found them all is itself a blind spot.
P.S. Thinking, Fast and Slow is a useful book for helping to identify the biases that create some of our blind spots.