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You can't fly into space with a plane. You can't kill ten adults, who are trying to protect children, with a melee weapon. Not before the police get there. Not unless you're some kind of supersoldier.
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That's why it was a stupid thing to say.
Also, getting up close, and personal with a knife is an entirely different ball game to the impersonal use of a fire arm. It takes a lot more mental instability to stab a person to death than it does to shoot them.