25 Mar '17 19:05>
Originally posted by apathistSuppression of emotion is one possible explanation, though on my part is not an intentional act. (I'm not Vulcan). A suppressed emotion (such as anger) will tend to come to the surface in another guise, more often than not as depression, the emotion turning in on itself. (Which can be quite destructive). - It can of course also present itself as apathy. - It is quite common for clients to present this way when I start working with them (though this is not to say people with mental health issues are necessarily without anger).
You imply that you suppress your anger.
I don't suffer from Schizoid Personality Disorder, but that's just one example of people who commonly lack the ability to get angry:
'Individuals with Schizoid Personality Disorder may have particular difficulty expressing anger, even in response to direct provocation, which contributes to the impression that they lack emotion. Their lives sometimes seem directionless, and they may appear to “drift” in their goals. Such individuals often react passively to adverse circumstances and have difficulty responding appropriately to important life events.'
https://psychcentral.com/disorders/schizoid-personality-disorder-symptoms/