Check out Mufasa, big, strong, powerful and his son is just like him. But Scar? Thin, weak, frail, alienated from the troupe. As a result he looks for another group to be a part of it and he became friends with hyenas. Don’t you think he would also prefer to hang with lions? If they didn’t push him out and cared about him, would he still hang with hyenas? Of course not. Scar thinks only way to belong back to the troupe is killing his brother and get the power. In this way we see a character fighting for his dignity and rights. The real bad guy is Mufasa who alienated his brother from the beginning for the fight for throne.