I find it really interesting that catharsis doesn't work - and that, more often than not, the person with a vested interest in ensuring they maintain the 'right' to vent their anger, is usually doing so as a means of social control, more so than personal development.

Whenever I've pointed out the issues with catharsis within my own immediate group (friends/family) I'm confronted with one of two viewpoints: a) my 'understanding of psychology is faulty, of course venting works", or b) "right, I should try mindfulness as a solution to my anger", where those in group A) are usually also quite narcissistic and borderline, and group B) more self-reflective/aware.