Yet I don't understand why the boss decided to choose the method of killing to protect humanity as he should realize that there's a lot of other ways that prevent bloodshed among us humans.
"So how about the captives that you hold in the cell then?"
"It's a similar case as well but a bit different… they're the one that couldn't fight and that will be killed by the other humans. To protect them, I put them there so they could be safe at least."
Don't know why but it seems like I disagree with all of his methods. Even if he's trying to protect them, the boss shouldn't have put them behind bars. It's wrong as the people there deserve freedom as well.
I also doubt that the boss had told them why they were being caged at all. Because of that, they all live inside that tiny prison in fear as they thought they would be killed soon enough.