I didn't make reference to acting out anger - I talked about acting on it destructively. Acting on it constructively is a different matter.
The side effects of a culture that stigmatizes anger or of acting on anger destructively, are that you experience it more.
That is certainly a problem, but it isn't what I was referring to. I meant that hate and anger can lead to burnout (primarily fatigue and depression), if they are experienced excessively.
Acting out the anger may in fact lead to reduced chance of burnout, as it prevents the emotions from building up inside.