Is it fine if you are mindful while doing it? Or did the Buddha denounce such practices as revelling or exaggerating emotions to provide temporary relief? I find that simply being mindful while repressing emotions has a tendency towards leading to passive aggressiveness.

To be specific, I mean actions like systematically screaming to release anger, systematically feeling to release sorrow... etc. Purposely releasing these mindstates and going over the top instead of repressing them. 

What about other traditions aside from Therevada? Do they share a similar view towards catharsis, or is that not the case?