Re: Aikido and inner aggression
In a way similar to the other thread, I think it can help. What Janet said regarding buttons we didn't know we had relates to this pretty well I think. Like you, I find a general improvement of mood after practicing which helps in dealing with my own stuff; I've found these moments invaluable.
I think the common altruistic idea of not harming your attacker and the everpresent idea of not harming your training partners can be a good mental exercise too.