In long-running anger the alarm is not broken. It is set too sensitive and too loud, which is two things to adjust rather than a character to fix.

What the research says

A review of this field concluded that difficulties regulating emotion turn up across a wide range of mental health problems and are a plausible maintaining factor and treatment target, while noting the evidence is largely correlational. Treating anger as a regulation problem rather than a character problem sits comfortably with how the field has come to think. Largely correlational means the causal story is still open.

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