That is sick... but I'm, sad to say, not really surprised.
What's wrong with kids today?? The culture and parents who are too lazy/afraid/uncaring! Whereas parents should be going against the more damaging aspects of the culture (increased violence in the news and on TV, apparent reduction in correction of crimes) to teach their kids that those things are wrong, instead they are practically rugs allowing their kids to do anything and everything without much, if any, correction or instruction. There seems to be a general 'Blah' attitude toward parenting these days! I have seen numerous occasions where a parent would be talking to another adult and completely ignoring their child...even when the child HIT said parent to try getting their attention, they just pushed the hand away and went right on talking. That's how it starts...
Now, I'm not saying EVERY parent is like this, of course... but the numbers are increasing and, therefore, so are incidents like the one in that news story.