> but as a creator of the weapon you can't know that, you have no control on how it's used That's not entirely true, especially if you are working for a milita

> but as a creator of the weapon you can't know that, you have no control on how it's used That's not entirely true, especially if you are working for a military. You don't have total control over how it's used, but you can decide which government you work for.