Most outbursts are a last try at getting something across. Underneath the noise there is usually a need that has gone unmet for a long time.

What the research says

In a randomised controlled trial of skills training for borderline personality disorder, the benefit ran partly through a shift from destructive or suppressed anger towards assertive anger, meaning anger that states a need rather than attacks. What changed was the form, not whether the anger was there. One trial in one clinical group, so take it as encouraging rather than settled.

Strength of evidence: one line of research. A single study, or a theoretical account.