As has been stated, had Paul Tibbets not have flown the mission someone else would have done.
But how long would it have taken to choose and train that person, and how many more lives across both the allied and Japanese nations would it have cost during that time.
Many servicemen from the bottom up have had to make similar decisions.
May he be left to rest in peace and his surviving family be able to remember him as a family man, and not the man who dropped the bomb.
I salute your memory, Sir
Paul.