I think it might be other way around. It's harder to kill if you or your friends are not in danger. And if you can see in all gory details and contemplate what effect your weapon has on the body of an enemy.
We're still in the beginning. Removing the "witnessing the carnage" part could still be accomplished one day. As I mentioned, using our brains just to simulate humans on-site controlling stuff at the battlefield may not be the best use we could come up with. Compared to what I had in mind, current drones are just glorified RC models. Thanks for the interesting link, though. This risk is always there, I guess.
