Americans who feel “excluded” are not excluded. They have decided to feel excluded. Which is, of course, entirely their right to do; no one forces anyone to celebrate any American holiday. But attempts to remove Christmas from the public sphere are destructive to our society. It would be as if Jehovah’s Witnesses attempted to remove public celebrations and references to the Fourth of July because they don’t celebrate national holidays.
Why are these attempts destructive? Because the entire society — Jews, Muslims, Hindus, Buddhists, and atheists as well as Christians — benefits from the goodness and joy that the Christmas season engenders.