Was that ever actually said? I don't remember hearing that using the stone "killed" the stored souls.
I don't know if he ever said those exact words, but the topic came up enough and the way he approached it made it clear that's how he feels. He talked about it when he beat the samurai dude. The samurai insisted that he shouldn't be considered a living being because he's just a soul trapped to armor. Ed told him to fuck off with that attitude, because if he agreed to that, then Al was the same. Philosopher stones are nothing but souls trapped in a rock for alchemic use. Then, when he was trapped with Envy, he used some of his souls to get out of the place he was trapped, and Envy had to convince him to do it by saying that the souls inside him no longer human. He did it, but it's obvious he wasn't convinced. Another incident is in Brotherhood, where this one character convinces Al to use the stone to save their lives by convincing him that the souls inside the stone wish to fight back as well. Plus Hohenhiem is a walking philosophers stone, and he interacted with every one of the souls inside him, so they are right. They don't have bodies, but their souls are incased in there. If they are used in alchemy, they are truly gone then.
Yes, it's definitely a matter of principles for those two. There are situations where they'll use the P stones if they absolutely (and I stress absolutely) have to, but they consider using a soul to be the equivelent of murder.
Edit: Oh, I misread it. Well, I only vaguely remember how it was in the original anime, but yes, in the manga and in brotherhood, P stones were souls of people trapped in a red rock. You use a P stone, this is the equivelent of throwing someone behind the Gate of Truth, which is ambiguous whether that is the same kind of death that people who die normally have. I don't think so, because in brotherhood, it seems that it's fully impossible to bring someone back from the dead. Possible to create life perhaps, but not bring anyone back.
Yes, it's definitely a matter of principles for those two. There are situations where they'll use the P stones if they absolutely (and I stress absolutely) have to, but they consider using a soul to be the equivelent of murder.
Edit: Oh, I misread it. Well, I only vaguely remember how it was in the original anime, but yes, in the manga and in brotherhood, P stones were souls of people trapped in a red rock. You use a P stone, this is the equivelent of throwing someone behind the Gate of Truth, which is ambiguous whether that is the same kind of death that people who die normally have. I don't think so, because in brotherhood, it seems that it's fully impossible to bring someone back from the dead. Possible to create life perhaps, but not bring anyone back.