You're pretty much right TS, but don't expect a lot of people to get that on this forum.
Although Korea is a little different. Look at what North Korea became, compared to South Korea. South Korea is actually a perennial G-20 nation, it's economic and cultural influence is extremely positive in Asia. It is a high-functioning democracy with a solid tech sector and generally positive\peaceful model for its neighbor's to aspire too.
Nothing wrong with going to war to prevent all of Korea from becoming what North Korea became, imo.
Vietnam on the other hand was the worst war crime of the post war era, (according to Geneva definition of War Crimes or War of Agression). Millions of Vietnamese simply murdered by American bombs and chemical weapons; a whole country destroyed based on the falsified Gulf of Tonkin incident, not to mention massive numbers of young middle class and working class Americans killed, maimed and traumatized...
Iraq is the same sort of thing. An imperial war that's done nothing but destabilize a region and destroy people's lives. It was good to kill Saddam but the price was far, far too high, for everyone involved, especially Iraqi's.
Afghanistan is a special case, it was certainly a war crime to invade the way the U.S did, and Bin Laden was in Pakistan - but the U.N did eventually "ratify" the invasion, in a manner of speaking.
You're right veterans should be more pissed off.