That's literally the same exact argument Zionists use. "Yeah we're bad, but look over there!"
Resistance axis tards and Zionists are two sides of the same coin, same fallacious reasoning. Neither side care about the people they claim to represent.
Rebels have committed war crimes, but on a much, much smaller scale than either Assad or ISIS, and most have been condemned by rebel leadership.
Yes, the United States has committed war crimes. But so have Russia, China, Iran, Israel, Saudi Arabia, Egypt, Turkey, Pakistan, India....every single country with some power on this planet has committed a war crime in some way, albeit all on different scales. Most countries are not ashamed of them, but some are proud of them (Israel, Russia, China, Iran, Saudi gov't to some extent.) To single out a single country is wrong. If you want to be hypocritical, go ahead and single them out. If you don't, pull your head out of your arse and see the reality of the world.