That’s not a great analogy though… you would have to add that, even though most people use it responsibly, banning digital encryption would cause a very dramatic reduction in harm caused by the people that don’t use it responsibly.

Furthermore digital encryption actually serves an inherent purpose so banning it would also cause some harm to society simultaneously. On the other hand, civilian gun ownership serves no inherent purpose so society wouldn’t be harmed by banning it, and we would only lose the risk.