Gone with the Wind
by Margaret Mitchell

"'All wars are sacred,' he said. 'To those who have to fight them. If the people who started wars didn't make them sacred, who would be foolish enough to fight? But, no matter what rallying cries the orators give to the idiots who fight, no matter what noble purposes they assign to wars, there is never but one reason for war. And that is money. All wars are, in reality, money squabbles. But so few people ever realize it. Their ears are too full of bugles and drums and fine words from stay-at-home orators. Sometimes the rallying cry is 'Save the Tomb of Christ from the Heathen!' Sometimes it's 'Down with Popery!' and sometimes 'Liberty!' and sometimes 'Cotton, Slavery and States' Rights!'"

What is the theme of this excerpt?