cuz it wasn't like in Avengers where there was an alien army causing all the destruction and they're trying to stop them and protect the people. Superman caused a lot of the destruction himself with what seemed to be little regard for anyone's safety. that's why by time Avengers Age of Ultron came around there was a big deal made of "save/protect the civilians" throughout the movie. even still, The Avengers basically ended up taking the blame for all the destruction anyway.