Perhaps one could say, "It was clear who was right and who was wrong--whichever side you were on, that side was right and the other side was wrong" whichever struggle is being considered. Whichever faction you identified with was right, just like now.
Even just looking at the Cold War period, this still doesn’t quite cover the complexities. There was an entire anti-war movement full of folks who thought the US should pull out of Vietnam without necessarily supporting the other side of that conflict/war.
