True, but at the same time you have to feel sort of bad for him. I mean, how would you feel if you were there while your parents picked a sibling over you? To me, it is a mixture between: "That jerk!" and "Aww. :c"
Yes, if you think about the fandom in all of it, plus the storyline, Mufasa was more the jerk at first, and Scar just turned into one through jealousy.