War Is a Racket (1933)
I started paying  attention to this when I lived close to DC around 2002. Bush was cutting the top tax brackets while ramping up for the Iraq invasion, the defense contractors made record profits (I remember one CEO making around 30 million) and the DC metro was plastered with ads touting the patriotism of the defense contractors. I thought "these guys are making record money, are getting their taxes reduced, try to look like patriots  and some clueless young guys have to go to war and die". Since then I honestly think there should be no profit in making weapons while a war is going. It's just not right that some people are raking in the big money without risk while some poor guys have to go and die.