There always is. The apple doesn't fall far from the tree in a significant percentage of cases. I think its important to do post analysis to the extent possible on the underlying symptoms that preceed such tragedies. Not to assign blame, but to have an honest dialogue and learn to recognize those actions and words that may be trigger points.
I can already see a specific level of denial in the aunt. She's on TV saying that Adam's mom wasn't one to dismiss problems and that she would've sought treatment or help for Addam if it had been necessary. Really? The guy who just killed 28 people didn't need help? How can you say that?