Of course I did! Like you've ever in your life thought anything through. He's a homonculus. And even if it wasn't yet another hare-brained scheme to kidnap us, you were still trapped in a fight with two immortal beings set on destroying each other. How long do you think Greed would have mourned if you'd gotten caught between them? You might get ten whole minutes! Never mind that Naoto did get a concussion and could have had worse if Dad hadn't been there.