I don’t think that it is. As I understand it the argument in favor of guns is that they would supposedly protect you against someone else with a gun.
I can’t protect myself from someone with a RubberDucky with a RubberDucky of my own. However, knowing that these tools exist and how easy they are to acquire and the ability to try one out for yourself might actually make you think twice about plugging that random cable or USB drive into your box.