If Romulus hadn't posted this I would have (I've had other things to do in my own little world of chaos); my source was different but it's essentially the same. Tibbets never said he had no regrets in respect to the deaths: “I’m not proud that I killed 80,000 people... We were at war. ... You use anything at your disposal.”
Much of the peeve/counter-peeve is nigh absurd; along the same line as whether Hitler intended to use the America bomber (if it had been effectively perfected, you really think not?). The bottom line is: we are not ultimately responsible for the lives of our enemy's people, we are responsible for our own. If you don't want your people killed, don't put them in the line of fire -- surrender. Preferably, don't attack us in the first place -- you've automatically put our fight for survival above yours. Whack a peaceful hornets' nest with a stick: within seconds you will have no immediate concern that killer bees have recently moved to only a 100 miles from you.

As a further matter of interest, Tibbets now has a grandson of the same name who pilots a Belgium-stationed B-2.