REASON AND CAUSE

Well.... when we come across the things we don't like or tolerate at that moment we get angry..... Causes to get angry are different from person to person... in terms of psychological theories of human development, when person's ego fails to satisfy his Id and superego, it gets into defensive state which can lead to many feelings like frustration, aggressiveness, anger etc..... to explain it in straight manner... when a person's ego can't accept the reality...the person vents his feelings in the form of anger and aggression.

I think when things don't hapeen as per our view then things get bad.