When you have been to the moon, you can't come back to Earth and stand in line at Starbucks. You can't order a coffee, and pay for it, and drink it beside someone wearing Sarah Palin glasses and a cruise visor. The regression to mediocrity is stunning and sapping. You would die inside.
After de-mooning, Buzz Aldrin got depressed and divorced. He drank and he returned to the Air Force. But the Air Force doesn't fly to the moon; it's glad to clear the clouds.