At 8? Sure, I think this kid probably has impulse control problems. He might have ADHD. He might just be a bit wild. But a lifetime of antisocial behavior? Maybe, but only because 1) he killed his sibling in a terrible accident 2) people will pass cruel judgement.

He's a child. Children do foolish, foolish things. I jumped off the roof holding an umbrella at around 8, a la Mary Poppins. (Fortunately, it WAS a low roof.)