I am just guessing, but I think the reference to 'black glass' refers to what you find at the site of a nuclear explosion. The implication I draw is that if the folks over there are recalcitrant, we should nuke 'em. Sometimes I think this is correct, sometimes I disagree.
"I am just guessing, but I think the reference to 'black glass' refers to what you find at the site of a nuclear explosion. "
That glass isn't black. It's a light green. ;)