You think beating this kid would have helped this situation?
You cannot have a society where someone can post YouTube videos of himself torturing animals with impunity -- and then treat him as a responsible, law-abiding adult simply because his juvenile records are sealed and his medical records are confidential.
Keep in mind that these "random" mass-casualty events are rarely seen outside modern industrial countries. The reason for this is simple. Primitive and aboriginal cultures don't have any room for @ssholes who give every indication that they are going to be depraved, disruptive members of the society. If this kid had living with the Sioux tribe 150 years ago, he probably would have been burned at a stake or fed to wolves the first time he tortured an animal in the encampment.
So, you don’ know the difference between “corporal punishment” and “beating”?
Are you at all aware of the concept that awareness of consequences is often a deterrent in itself?