I can't imagine that Mr. Sanders lacks the understanding that the wars abroad rob the treasury at home.
From the article:
"The Open Door Policy, Williams argued, guided American foreign relations over the course of the 20th century, turning military power into an agent of economic expansion."
Thomas Friedman put it this way:
"There could be no McDonalds without MacDonnell Douglas."
John Perkins explains how first arm-twisting takes place to win leaders over to U.S. corporate donors' causes, and if that fails, the jackals are sent in to do the dirty work.
Mr. Sanders may or may not dare to speak out against the MIC until he has hold of the official Oval Office. The track record of great risk is obvious... it was when Martin Luther King connected the Vietnam War costs with the depressed opportunities for the poor at home that he was killed.
And when JFK sought to curtail the NSA, CIA, and the efforts of those whose lives depended upon inventing enemies to kill, conquer, and plunder... he, too, was taken out.
When anyone in mass media so much as challenged the Bush Junta's call to war... off with their heads (symbolically) things went.
To challenge the Empire's military apparatus is a very dangerous proposition these days.