The black and white thinking that shows up in anger is not proof that something in you is broken. It is what a threat detector does, and threat detectors are built to be crude.

What the research says

In a randomised controlled trial, skills training worked partly by shifting people from destructive or bottled up anger towards assertive anger, meaning anger expressed as a statement of a need rather than an attack. The aim in that work was never the absence of anger but a change in its shape. It was a trial with patients diagnosed with borderline personality disorder, so the population is specific even where the principle travels.

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