A twitter person points out:
I’m old enough to remember the Cold War but then so are many Sanders supporters. I suppose the main thing that inoculated me against the far-left was growing up Catholic, which meant that I was well aware of Communist atrocities committed against my coreligionists. It must be great to be a Communist, you are never called to account for the misery and destruction caused by your ideology and you are forever judged on your intentions, which you assure us are nothing but good.*
The problem discussed elsewhere the thread above is that American education is less and less historical and increasingly ideological. The ideological assumptions that motivated the American misadventures in Iraq and Libya was that all people everywhere long for freedom and democracy, and that simply removing the evil dictator will let the people’s innate goodness flow forth. Iraq was led by the American right, Libya by the American left, but the underlying ideology was the same.
I suspect our foreign policy disasters are going to get worse as time goes on, because the ideological commitments of our elites are getting stronger and therefore more divorced from reality.
* I don’t believe Communists (or Socialists like Sanders) really have good intentions. People only go into politics to accumulate power the way people only go into business to accumulate money, the difference being that businessmen don’t feel the need to lie about their motives.