I am probably (one of) the most skeptical of psychiatric diagnoses on this forum, but I do believe that there is a useful entity called intermittent explosive disorder - it is just very rare. People who rage are usually narcissicists, people who beat their wives are usually simply unpleasant people, people who are hot headed usually have poor impulse control in general.
We can see this occur in neurological disease (I have a patient with temporal lobe epilepsy who meets criteria for IED although it is likely some sort of epileptiform thing - he has no recollection of these events). Actually responded very well to high dose prozac (depakote alone was not helpful nor were antipsychotics). We know that impulsivity correlates with low 5-HIAA CSF levels (one of the most reproducible biomarkers in psychiatry) so it is not surprising perhaps that some of these impulse control disorders like intermittent explosive disorder responds well to SSRIs.
Incidentally, the ICD-10 does not have the diagnosis, the closest is emotionally unstable personality disorder, impulsive type.