This book is hot of the presses, and has great reviews. I cannot wait to read it.
I am more concerned about the subject matter (active shooters) now than ever before. That does not mean that I am less concerned about your basic street thug / holdup man. They are still dangerous animals, but those sort of goblins usually (but not always) just want to part you from your money and run away. Active shooters are psychopathic killers who indiscriminately hunt and target humans in order to kill them. Not much in the world is more dangerous than that.
At Semper Firearms Training we encourage you to buy a good firearm, get trained in how to use it, get a Nevada CCW permit, and continue your firearms training as part of a defensive lifestyle.