It could be brought up to establish a pattern of rash behavior.
It appears that the:
The court ordered Zimmerman to attend anger management classes.
...from the arrest with the confrontation with police was
before he got fired for excessive anger (if the Mother Jones report turns out to be true).
George Zimmerman, Trayvon martin's shooter, was fired from a 2005 job as a security guard for excessive aggression, a former co-worker told the New York Daily News Thursday. The paper reports that Zimmerman had worked on and off for several firms that "provided security to illegal house parties."
So obviously the anger management classes didn't work very well!
Also how can a firm "provide security to illegal parties"??? Wouldn't that be illegal?