Good article. It gives a good overview of the particular pathology but also highlights the problem of how to identify these individuals.
We must also understand that these individuals aren’t limited to firearms.
To be honest, we have been fortunate that most have chosen to emulate attacks carried out by others who have been immortalized by the mass media. A simple change in the type of firearm employed could have significantly increased the number of casualties in the recent incident in Gilroy, California.