People say that because Vasudeva and Devakī wanted Kṛṣṇa as their son, He appeared. Kecit. Somebody says. Vasudevasya devakyāṁ yācitaḥ. Being requested, being prayed for, abhyagāt, He appeared. Ajas tvam asya kṣemāya vadhāya ca sura-dviṣām. Others says the same thing, as I was explaining. Paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām (BG 4.8). Actually Kṛṣṇa comes to pacify His devotee. Just like He appeared to pacify, to satisfy His devotee, Vasudeva and Devakī. But when He comes, He does the other business. What is that? Vadhāya ca sura-dviṣām. Vadhāya means killing. Sura-dviṣām.
There is a class of men, they are called asuras. They are sura-dviṣām. They are always envious of the devotees. They are called demons. Just like Prahlāda Mahārāja and his father, Hiraṇyakaśipu. Hiraṇyakaśipu is the father of Prahlāda Mahārāja, but because Prahlāda Mahārāja was a devotee, he became envious. That is the nature of the demon. So much so envious that he was prepared to kill his own son. The only fault is that little boy, he was chanting Hare Kṛṣṇa. That is his fault. The father could not. Therefore they are called sura-dviṣām, always envious of the devotees. Demon means always envious of the devotee.