War is when the government tells you who the bad guy is. Revolution is when you decide that for yourself.

Benjamin Franklin (1706-1790) American statesman, scientist, philosopher, aphorist

(Spurious)

Not found in the recorded works of Franklin, nor of Napoleon Bonaparte (to whom it is also attributed).The number of variants is an indicator this is an unconfirmed attribution:

• "... who the enemy is" or "... who your enemy is."
• "... you figure it out ..."

The term "bad guy" is an Americanism from the early 20th Century (the OED dates it to 1932; Dictionary.com to the early 1920s). But even if one uses the "enemy" variant, this sounds unlike either Franklin or Napoleon.

• Despite his skeptical nature, Franklin did not speak out against propagandistic influences on war (or revolution). Indeed, he was a skilled, if subtle, propagandist himself. Nor did he object to "government" in general (he would have attacked "the Crown" or "Parliament") nor any war that the British government had declared.
• Napoleon, as self-appointed Emperor of France (and war-maker, though most of his conquests were a result of other countries declaring war on him) would not have made the first half of this phrase, as he was the government. Nor, as one whose regime depended on propaganda, would he have suggested people decide for themselves who the true enemy is.
• Neither man, as a rule, wrote their various aphorisms in the second person ("you"). At most they might have used "one"; more often, it would have been "a man" or some third person construction.

The quotation is occasionally attributed to Susan Sarandon. While she did use it (e.g., at a pro-Palestinian speech), she attributed it in turn to Napoleon.