As Krishna appeared in order to kill the demons,the demoniac mentality of the people in general is killed in this age by the chanting of the Hare Krishna mantra:
Whenever there is burden created by the demons and whenever the innocent devotees are distressed by demoniac rulers,the Lord appears in due course of time to kill the demons with the assistance of His real representatives,who are technically called demigods.In Upanisada it is stated that the demigods are different parts of the Supreme Personality of Godhead. As it is the duty of the parts of the body to serve the whole,it is the duty of Krishna's devotees to serve Krishna as He wants. Krishna's business is to kill the demons,and therefore this should be a devoter's business also. Because the people of Kali Yuga are fallen, however, Sri Caitanya Mahaprabhu, out of kindness for them, did not bring any weapon to kill them. Rather, by spreading Krishna Consciousness, love of Krishna, He wanted to kill their nefarious, demoniac activities. This is the purpose of the Krishna Conscious movement. Unless the demoniac activities on the surface of the world are diminished or vanquished, no one can be happy. The program for the conditioned soul is fully described in Bhagavad Gita, and one simply has to follow these instructions to become happy. Sri Caitanya Mahaprabhu has therefore prescribed:
harer nama harer nama
harer namaiva kevalam
kalau nasty eva nasty eva
. nasty eva gatir anyatha
Let people chant the Hare Krishna mantra constantly. Then their demoniac tendencies will be killed, and they will become first-class devotees, happy in this life and in the next.