Life is so unfair. While we believe that ultimately (and ultimately can take an eternity!) justice must and will prevail—to believe otherwise would be to deny the essence of Judaism—it is clear that life is full of injustices. Moshe Rabbeinu was the greatest person who ever lived. Yet he was denied his one wish, to be able to walk in and breathe the air of the land of Israel. Moshe continued pleading his case until G-d "angrily" told him, enough already! Your request is denied.