The big 3 they'd think of would be Korean, WWII, and WWI before it. I don't much think that those are the ones you're claiming were morally questionable, are they?

Sure, there were many. Find me a highschool graduate in Podunk Alabama that knew all of those "more than half a dozen", and was enlightened enough to care that natives were genocided a century earlier.

"Gee, why didn't someone in 1968 have the same sensibilities that I have?!?!"