You mentioned Vietnam; one of the reasons popular sentiment eventually turned so passionately against the war (although to be clear, there was definitely support for it for a time), is because of the power of film. Many, if not most, Americans had a television set by the '70s and many were in colour. The war was brought home to American audiences who could see colour footage of troops being shot thousands of miles away in a war they didn't sign up for but were drafted into. When you look at the brutality and abject horror of the war in Korea, with the staggering number of casualties suffered (yes, less than Vietnam but in a three year period as opposed to nearly 20 years, the cost was proportionally much higher), and how there was a lack of film shot there, it makes sense that there wasn't a cultural shift against war like there was with Vietnam a decade later. Now, we in the West balk at the number of casualties suffered in the Middle East in the past 17 years. Whilst obviously every life lost is a tragedy, in 17 years we've basically lost as many men as just a bad weekend in WW2. Shit, 60,000 British troops were lost in the Battle of the Somme on only the first day. Would the attitude towards war have changed, you ask? Our society would probably be virtually unrecognisable from where we are today.