"I agree with you that Brown will be a complete disaster with it’s BYOB approach to education. I also agree that Dartmouth culture will likely clash with my son’s personality. However, I also strongly believe in adaptability. "
If you strongly believe in adaptability, why are you so closed-minded to the idea of other schools other than those you have decided the son must apply to / get in? At least be honest and say you don’t believe in adaptability, since you’re not going to change anything.