I've read his On Killing a couple of times and found that he had to, by virtue of the topic, speak in generalities. The failing(s) was that his only exception - that I can recall at this hour - was for the psychopath. In other words, if someone did not fit his category du chapter they were lumped and dumped inro the bin marked "psychopath".
Additionally, if I hear, or read, or get referred to his essay on sheepdogs one more time I am going to chew through the restraints and go out and hurt someone. Yeah, some of the folks who become cops are "sheepdogs" as opposed to "wolves" or "sheep", but there is a whole tribe of folks out there who do not give a darn about the flock. They may not even be the alpha of their extremely small pack, but that group is the limit of their circle of concern. Grossman and almost everybody else seems to have totally ignored them.
What I'd like to read is Grossman updating himself on the post-Obama military and police/firefighter/EMS folks. Ihace a strong suspicion there are some rather different motivations at play.
stay safe.