The only thing Loki is guilty of is going too far and catastrophic decision-making. Yes hes devious and achieves his goals through trickery, but one could argue that banishing Thor is a pretty laudable goal. The first act of the film makes it clear that Thor is in no position to rule in fact, his rule would probably result in much of Asgard getting annihilated in a war nobody wants. Remember, when he does go and confront the king of the Frost Giants the supposedly really evil character in the entire ensemble he firstly doesnt want to engage the Thunder God, Lady Sif and the Warriors Three because he knows what his actions might unleash. Everyones reasonable except Thor, who duly starts a war by reacting to someone calling him a princess. The question is, do you really want that man on the throne? No you dont Lokis banishing plan was probably the best thing that couldve happened. Really, it did seem that Loki was far better suited to ruling, if only because he understood the subtleties of power. After all, the man does eventually obliterate the leader of Asgards sworn enemies using nothing but double-crossing and trickery, a decision given extra weight by the fact hes killing his own father to save an adopted father who only took him in as a political gambit. Until he decides to blow up Jotunheim again, for understandable reasons in wanting to protect Asgards borders while preventing a bloody war hes actually doing a good job of ruling. The one pre-genocide mistake he makes is telling Thor Odin was dead, thus sparking off his transformation into a competent individual. Other than that, hes the ruler Asgard deserved. Agree or disagree? Can you think of any more? Feel free to comment!