The process of releasing strong emotions through a particular activity or experience, such as writing or theatre, in a way that helps you to understand those emotions (Cambridge)
the process of releasing strong feelings, for example through plays or other artistic activities, as a way of providing relief from anger, mental pain, etc. (Oxford)
It’s the director’s hope that Germans who see his movie will go through a catharsis similar to his own. (Cambridge)
go through a catharsis
Cleansing
Release
Lying
Unfairness
Cathartic