First, I'm not familiar with that book, but I'll read it (it's on a list, but pretty far down, I'm afraid) when I get the chance.

Second, no statistical argument could convince me. All such arguments hinge on the assumption that the past will repeat itself. That folks get proven wrong on that assumption on a frequent basis is enough cause for me to discard it. Deductive logic tells anyone that firearms are not the agency of crime, but tools of individual criminals. Following the necessary steps afterwards, one is left with the conclusion that firearms do not, per se, have an effect on crime rates.