Caitanya Mahaprabhu, Lord Krishna they came down to attract the living entities, to give them an opportunity that, “You are looking for happiness, this is where the real happiness is in transcendental exchanges with the Lord.” When Krishna came down, everyone in the entire world became Krishna conscious. Whenever Krishna is present it polarizes things. Devotees they immediately become attracted and they all want to discuss Krishna and the demons they also become immediately attracted, they also want to discuss Krishna but they are envious.
So all of the demons they came forward and those who became fully Krishna conscious they got the opportunity of being annihilated by Krishna materially and spiritually liberated which is what they wanted. But they didn’t have to go through any more birth. And the devotees they were able to leave this material world and to transfer themselves somewhere to Krishna’s pastimes and in this way also achieve liberation from the influence of the three modes of material nature in the association of the Supreme Lord.
Now many souls were there who did not get that opportunity, they were not humans or otherwise available for being liberated by the Lord. So again the Lord came as His own devotee, as Caitanya Mahaprabhu to attract and uplift and to send off these fallen souls back to home, back to Godhead.
H.H. Jayapataka Swami Maharaj
1984, 10th June, SB class, Ekadeshi lecture