I think the kid was pretty much minding his own business and got a bit lippy when he was challenged. The point is that positively identifying someone as a threat can often be subjective and proven wrong in the cold light of day. The default should not be bad people deserve death. We know very little about Nero's crew. If you want to get more imaginative with the tech, then as soon as your enemies' shields are down, you beam across neutralising gas. Then you beam them off. If their shields are still up, they're still a threat. The problem with Treknology is that using it properly would suck the fun out of the fights so we have to pretend like it can't do it.