That's exactly the case. I am arguing that it is ok to kill innocent people sometimes. To give a ridiculous example...
The human race is going to end on Tuesday unless Bob is killed. Bob has done nothing wrong. However, he has a unique genetic condition that means, on Tuesday, he's going to come down with the plague, and it's going to spread and kill everyone. There is no way to stop it except to end his life before that happens.
I would kill Bob in this situation. I might hate myself for it, I might even take my own life knowing I had killed someone (or maybe not, because of my religion; I wouldn't know until I was in the situation). That being said, I would kill Bob to save the rest of the human population.
The human race is going to end on Tuesday unless Bob is killed. Bob has done nothing wrong. However, he has a unique genetic condition that means, on Tuesday, he's going to come down with the plague, and it's going to spread and kill everyone. There is no way to stop it except to end his life before that happens.
I would kill Bob in this situation. I might hate myself for it, I might even take my own life knowing I had killed someone (or maybe not, because of my religion; I wouldn't know until I was in the situation). That being said, I would kill Bob to save the rest of the human population.