Should humanity ban guns and weapons? Should the United States go first?
Do you think that if we banned guns an alien civilisation would make peaceful contact with us when they had observed that we were no longer violent savages?
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If there was this theoretical button that would destroy all guns past, present and future, I would press it. However, this button doesn't exist (obviously) so banning them outright will not do any good. If you do that, criminals will still find a way to obtain them, and then they would become virtually invincible given that they have tons of ammo.