But actually _hack someone up_? I'm sure if you dehumanized the "key carrier" like the Nazis did, you could probably get someone to do it. But if you've dehumanized someone enough you're willing to hack them up to follow an order, you wouldn't be working with them.

The American military fighting in Vietnam dehumanized the Vietnam soldiers in order to justify killing them, but imagine if one of those American soldiers were told by his commanding officer that in order to kill more "Charlies", he'd have to kill his friend he's been fighting with since the beginning. Sure, you'll probably find someone crazy enough to do so, but a lot of people wouldn't do it.

TLDR: It's different when it's someone you work with