Tired of Talk of "Workplace Violence"...?

So why did this "workplace violence" involve two attackers—both Muslims?

A neighbor of the killers noticed much nighttime activity in the killer's garage—prior to San Bernardino County's Christmas Party. (Grenades, ammo, bombs found). He didn't tell police because of "PC".  

The killer videotaped, then downloaded the caper for ISIS, and left bombs for first-responders in his SUV.
http://www.cnn.com/2015/12/03/us/san-bernardino-shooting/index.html