When does violence justify dismissal?

Violence in the workplace is unacceptable. That’s hardly a startling statement. But what is the punishment for violence? At what point does it rise to the level that will justify a dismissal for cause? Where is the line drawn between dismissal and some other milder form of punishment?
|Canadian Employment Law Today

The Ontario Arbitration Board recently dealt with a case where a dairy worker assaulted a security guard and whether or not the violence justified dismissal. In doing so, it dug up an arbitration decision from 1975 that contains a number of questions that can be asked in figuring out whether the line has indeed been crossed.

Worker attacked security guard

The worker was a lead hand at a dairy products processing facility operated by Natrel Inc. He had been with the company for more than 20 years. On April 13, 2005, he was working alone during the night shift.