Possibly he is too busy trying to fix health insurance and tax reform to take in a show. How do you know he really said it? I got a face book post of a fenced in yard with a sign on it that stated by Presidential order the space was being reserved as a detention camp. If one bothered to look up the number of the order, you would see that the order was signed by FDR and this was an art project. of course glancing at it on Facebook makes it appear to be a horrible truth.
And honestly being a New Yorker, I still remember where I was on 9/11. It is not an event I want musicalized even if the theme is the coming together of stranded people.