Tough decision to make... while I believe what Halsey did to the original Spartans was monstrous the fact of the matter is that John wouldn't have been able to accomplish half of the things he did if he wasn't a cold hearted killing machine above all else. He didn't care whether he lived or died, how many creatures he had to kill in order to accomplish his goal, how high the odds were stacked against him, and he didn't let his emotions get the best of him on the battle field because he had none. John is the prime example of human efficiency, but is the sacrifice worth the end result?