For once there are a lot of unethical humans as other posters point out but it really doesn't matter. The actions to kill people are often result of many relatively innocent decisions: increase funding here, agree to some military testing there, give a bit more secrecy to some people, some more decision making power to others, write some more allowing, aggressive sounding policies and suddenly everybody does what's "necessary" and people are killed.
If incentives are in place, nature will find the way even if you can't point to one single person who actually pulled the trigger.
If incentives are in place, nature will find the way even if you can't point to one single person who actually pulled the trigger.