The Vietnam War didn't mess us up too much because the country largely was on the same page with the Cold War. Afghanistan and Iraq really messed us up. Too many people can't distinguish between exercising influence and power in foreign countries in our national interest, versus getting bogged down in forever wars in foreign countries. That's how we get to a sizeable percentage of our country wanting to cut off aid to Ukraine, and no one really concerned about the possibility of an attack on Taiwan.