A Question on Gun Laws
Let’s begin by admitting that this is an America-only problem, and that, even here, in the world capital of mass shootings committed by the mentally ill, this would represent a rare situation in which a parent would find him/herself.
If you’re an absolutist on the Second Amendment, you might infer that the fellow here is the “good guy with a gun,” i.e., the “only one who can stop a bad guy with a gun.”
Personally, I’d grab my kids and leave, but not before telling the owner of the establishment, “If you think I’m going to subject my family and me to the danger posed by people openly carrying lethal weapons, you’re incorrect; don’t expect to see us in the future.”