I think you're confusing the sport hazard plays with rugby. He may be an athlete at the top level but that really doesn't mean he's going to have really strong arms. He probably weighs less than the ball boy.
The ball boy is clearly a bit of a **** but I don't think you can say he had it coming.
That's not true at all. Have you ever met footballer who plays anywhere at this level? Guys like Mata or Hazard may *seem* flimsy when you see them in the TV fighting all those huge defenders, but if you'd run into them just on the street, you'd see they are actually in great shape. There is no way Hazard would have trouble getting the ball while using both hands (which he tried before he resorted to kicking) if this was just wimpy defenseless primary school child.
To clarify, i'm not trying to say its fine to kick all the kids as long as they weight more then 60 kilos, but lets not try to make it sound like Hazard massacred a newborn.