Looking at the history of violent crime in this country, there's no real provable link between the crime rate and gun ownership
Well, maybe not here, but do a bit of research on how well the lack of civilian gun ownership (via an aggressive gun ban) served, for instance, Australia. Crime rates went up by a considerable rate; ironically, gun related crimes as well.
Criminals, for the most part, are individuals of opportunity. Essentially, they thrive on preying on the weak/defenseless/vulnerable. An armed citizen, either inside or outside the home, can go a long way in countering such issues, IMHO.
I do honestly believe that (and word does get around...even within the criminal arena) when more law-abiding individuals are allowed to keep and/or carry guns, the end result just might be less criminal activity. After all, Im betting that even criminals are no more anxious to meet death than the rest of us.
Now sure, we have our local PD for such matters. But, after all is said and done, they are more reactive than proactive (no offense to LE). Far too often they arrive after the fact. Given the rampant violence present in todays America, this is simply unacceptable by my standards.