Another thing, i don't think Snyder's aim was to create a likeable superman(maybe it was) . He took all the books. Made a movie according to his leanings. He wants the destruction, killing, superman concept itself ... Etc to be discussed, not blindly embraced.Siegel and shuster never made more out of the character than it actually is. They wanted the character to be this shocking and entertaining figure that's meant to be talked about. Look at, ac#1 and the reaction of people. Do they look like they saw a hero save a damsel? Granted these are all bad guys. But, still superman is, was and always will be controversial one way or another.
So, i don't understand the notion of superman as "role model". He is just a guy doing the right thing with many contradictions. Sure, if you see something worth emulating in the dude that's awesome. But, he ain't it.Moreover,strangely a superman that's not meant to be "Role model" comes of a better hero than those that are designed to.
"This is my world" superman says.
While the world says, "You can go ahead and die for us. We will throw you a parade"
These guys didn't waste one second to nuke superman. Yep! Goldenage superman, silverage guys, astroboy.. Etc all felt the alienation and loneliness of being used by humanity for its own needs. Granted there were good people that didn't. As said, there is no glory or vengeance in being superman. He gets nothing out of it except a good work out.