As with most anti-gun rhetoric, it's not usually grounded in facts or logic.  But makes sense on a superficial emotional level.  While overall number of guns has grown substantially in this country, guns were much more common in households 50 years ago.  Gun owners now, are more likely to have more guns in their collections than in the past.  The other fly in Janowski's argument, is that the number of police being killed on the job has actually decreased substantially despite the sharp increase in gun sales.