This book is poorly researched and presented. I bought this book after Dave's talk at the NRA convention, and it failed to deliver. Basically, it's 200 pages of him giving examples of shootings and saying, "see, I'm right, look at the evidence".
Correlation doesn't indicate causation.
The arguments made are infantile, and don't further any intellectual discussion; especially if you are well-read on the issue of gun violence. Several well known incidents are tacitly regurgitated, and then Dave talks about a school program he supports. I like the program he tries to sell, but don't care for the book; or his research.