I use it to place the blame of someone refusing or failing to understand on myself. The goal is not to signal a lack of investment, but to give someone a way to admit to being wrong without actually having to admit to anything. It sometimes helps remove a person's ego as an obstacle.
It's the difference between "I failed to be understandable" and "You failed to understand". With the former, they can come back and say that since I've clarified so helpfully, they agree with me without impugning their previous position. The latter allows no such latitude.
It's the difference between "I failed to be understandable" and "You failed to understand". With the former, they can come back and say that since I've clarified so helpfully, they agree with me without impugning their previous position. The latter allows no such latitude.