I was stunted because there is no challenge or practice in repeating: "Your proposal is a mistake. I know this because it is a common mistake, that a lot of people in your position have made before. It worked out badly for them; it will work out badly for you. It would be a waste of both our time for me to investigate the specifics of your situation further because I already understand the reasons you are making this mistake and there are no specifics which would make it a good idea."