I'm not about to argue that "one guy with a gun" could not end violence. To a great extent, however, that's irrelevant.
A workplace is not like a Long Island commuter train or a Luby's Cafeteria. It is a place where people know each other and to a great extent *must* trust one another. So, to ignore warning signs is just plain stupid.
The key point of the article is that impending violence very, very rarely happens without warning signs. It's just that folks ignore these signs and then we have the, "...well, he was a real quiet guy, never bothered anybody...". In a word, BS.
Almost every time, back-trailing the perp reveals a pattern of statements or actions well before he's chewed out, or passed over for a raise or promotion...And then some clue afterwards in the form of sullenness or hostile comments to some co-worker or family member.
If I'm running a business with a bunch of employees, do you think I'm going to advise the whole crowd that, "Well, one of you is a potential nutcase, so everybody get a CHL."?
Duh?
, Art