Ah, the lion. The noblest of animals, always sitting majestically on top of some rock, overseeing his dominion and protecting the pride and so on. Lions are even used in reference to Jesus in the Bible, and Aslan is basically a furry Lion Christ in Narnia.
Why Are They Assholes?
In technical terms, lions are what Samuel L. Jackson would call "motherfuckers." If there is one thing lions love to do, it's moms. Unfortunately, female lions don't like to put out when they're raising a kid. So, when the lions want some but the kids are in the way, they walk up to the little brats and maul them to death. Then, to add insult to injury, they bone the mother ten ways till Sunday.
To put this into perspective, imagine your mom having sex with the kid who stole your lunch money in school, but replace "stole lunch money" with "turned you into a bleeding stump of a man." Surprisingly, this means Scar from Disney's The Lion King is the most accurate portrayal of a lion, despite all the singing, dancing and Whoopie Goldberg. You know who should be glad this kind of thing is not acceptable among humans? Angelina Jolie's kids.
This is how humans see the world.
This is how lions see the world.