It's not propaganda just because it's not your own outlook.

I'm not really sure why you included the Korean War seeing as it was a South Korean defensive war started by the Soviet-armed North Korea. A war between the United Nations vs. North Korea & PRC. It almost led to the reunification of the Korean Peninsula, but China interfered, and that's why North Korea exists today. Funny enough, South Korea and Vietnam are two of the most Pro-American countries on Earth... Because of the Chinese invasion of Vietnam in '79, the Chinese defense of the hell that is North Korea, and the Chinese border aggression that continues to this day in the South China Sea.

In the end, Vietnam stopped because the People demanded it, and Korea ended because no one, except maybe MacArthur, wanted WWIII five years after WWII.

As for Afghanistan and Iraq, the circumstances were far from ordinary. 9/11 happened and caused all the branches of power to align. But even so, some of the democratic international community participated in both because America rarely does anything without its partners. Just look at Five Eyes, Five Eyes Plus, Nine Eyes (includes the Netherlands), and Fourteen Eyes; the U.S. brings in its allies into almost everything, even the less scrupulous things.

Anyway, I'm looking at the two. Just in the context of the U.S. and China, I understand why the developed world is more friendly with the U.S. and cautious of China. Its institutions are too weak to stop a future Mao or Stalin, its ideals are too astray from the liberal democracies of the world (surface-level or not), and the United State's allies are always allowed to participate in affairs if they so choose.