I thought you can vent to relieve tension and for healing purposes so long as what is said is in certain context and spoken with pure and constructive intentions.
To make the world more just doesn’t Hashem need us to bring light on injustices?
Isn’t that why even rabbonim today make it a point to ask us to not cover up abuses domestic and otherwise, even when we’re afraid of being shunned by neighbors and community, G-d forbid?