Workplace violence? Well sure! So was Pearl Harbor! /s
Not to mention the attack on 9-11 at all three sites, the twin towers, the Pentagon, and the airplane taken down in Pennsylvania. All in the workplace violence. I suppose a battle field is also a workplace according to their description.
They cannot even correctly refer to violent work incidents. The correct term for workplace violence is “going Postal.” This attack was jihad, not workplace related. He struck a blow for Allah against the infidels. Ali Akbar, 72 virgins, and so forth.