This seems to be because they are a bunch of babyboomers, stuck in the 1960's and unable to see anything without fond memories of how they stopped the war in Vietnam. It has to be Vietnam all over again or the U.S. might actually achieve its goal.
But now Senator McCain is being accused of reliving the Vietnam War and it is just awful.
According to Dan Amira of the NYMag :
A 71-year-old who is still reliving the Vietnam War in his mind? That’s not scary at all!
What is scary is how this generation is incapable of growing up and moving on.
End of rant.