That's what you say.

[Eren doesn't have to believe anything any mutant says.]

I want to live back home, with the people who care about me! Not some kidnappers.

[Sure, he'd like to live, but now he's all alone. And if his family thinks he should die, then that's probably what's best for him!]

What the hell? I don't want to hurt little kids, even if they are mutants. I'm not some murderer! And I don't want to be a monster. So I'm not going to risk it at all. I'll never ever use it again. I'd die first!