I reflected on why anger is bad. I found an answer in a hadith. This hadith is mentioned in Bayhaqi: إِنَّ الْغَضَبَ لَيُفْسِدُ الْإِيمَانَ (Anger corrupts a person's faith) Shuabul Iman 7941.

Here, iman or faith is not meant simply in the sense of a ritualistic belief. Here, iman means divine wisdom. The hadith means: Anger corrupts your divine wisdom. God Almighty has granted you divine wisdom, which you receive from having faith. But this wisdom gets jeopardized when you are angry. I contemplated on this and realized that the first disadvantage of anger is that you lose right thinking. You must think about this based on all the incidents of anger in whole of history. Whenever anger rises, right thinking comes to an end.