His grandfather Swayambhuva Manu saw that the Yakshas were being killed need lessly. His heart melted. Accompanied by many great sages, he went to Dhruva. He taught him the path of wisdom. Dhruva bowed to his grandfather.
Ignorance leads to anger.
One devoted to God will never be angry and act rashly. You are a holy man, for you have seen Lord Narayana you must not do such a cruel act. It is your duty to have patience with those who do wrong. You should be patient with criminals. Pity those in sorrow and be friendly towards all creatures.