Just dwelling the implications of what the hulk might have accomplished with that second snap of his. Simply returning all the ones eliminated in the first snap without changing anything else is a stupid thing to do. Does the snap return all the people who vanished from planes and spaceships even when the vehicles they were in are no longer there. What able the ones who were in cars like the scene from the end of Infinity War? Do they all end up dying horribly just a few seconds after materializing? And we've already seen the post apocalyptic effects of the first snap. Can a devastated world keep all these billions of people from starving to death while the world gears back up to pre snap levels? Maybe the next few Marvel movies will show the Avengers in hiding from all the people who want to kill them.