I wonder...would the author feel fearful if the coffee shop had several police officers in it, all packing heat? It's a curious thing, this fear of lawfully armed citizens.
I think it'd be an eye-opener for Bob to attend a concealed carry class and see how limited the usage of a weapon in self-defense is, as it's not like most CCW folk carry to win arguments or threaten people who mouth off or walk into Starbucks like Yosemite Sam. I could go on, but I'm preaching to the choir here.
K40 SS / PM9 / CW45 / SIG P230SL
NRA EPL / Buckeye Firearms Assn.