My guess is that it's a security thing. Even if they don't know the security key, I would prefer if they kept no record of the message. The real issue is that

My guess is that it's a security thing. Even if they don't know the security key, I would prefer if they kept no record of the message. The real issue is that they could just make a lever that would still store "secret chats," unless if they're being delievered p2p.