Why did they delete this scene from Thor 2?
Because the world is a cruel and terrible place. Or maybe they were trying to save us from the pain? Because watching this, you see what Loki really wants. He wants to rule his kingdom, yes. But he wants to be loved, revered, respected. Not only that, he doesn't want to be the villain. He wants to be so good he's worthy enough to wield Mjolnir.
Yeah. Let that sink in.
Maybe it's a good thing this wasn't in the movie?