Why would a group that works as a sort of paramilitary police, investigators and bodyguards have a rule against killing? That really doesn't make sense.
- It appears to be a rule that varies from country to country. One directly enforced by that country's government itself rather than the group. As for why, that's anyone's guess, but I would assume it's because the actual military exists, making the specific group killing the suspects redundant. Not that this appears to be explained In-Universe, mind you.
