I think pretty much everything I want to say about this horrible, horrible incident has been said already (apart from the loser idiots thing). The witness accounts are simply heartbreaking. All I can add is that it's such a sad, selfish thing when someone feels it necessary to take something nice, something normal, something that gives people pleasure and destroy it just because they can.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'