If it's normal to be able to beat/maime/maul/murder children in Azeroth, why aren't you allowed to do any such things to any child NPCs in the game? Why are there no quests that involve the subject matter? Is it only okay to beat kids if you're a king?
It doesn't matter that he's SO STRONG. He doesn't have any self-control, and hurt his son because he was angry. That's not right.
And if you're not supposed to judge characters in Azeroth because it's not the same laws/social stigma/ect, why do people do just that with all of the Horde-side characters? Is Sylvanas suddenly okay because you just don't understand what she's going through? No, she's still pretty terrible, just like Varian is a child-beating monster.
---------- Post added 2012-04-16 at 06:44 AM ----------
It doesn't matter if he 'only' grbabed Anduin on the arm, he physically and emotionally hurt the boy enough for him to run to Velen's foster care.