So when God appears, incarnates, descends, His business is to protect the devotees, paritrāṇāya sādhūnām. That is His first business. Vināśāya ca duṣkṛtām (BG 4.8): And to kill the unfaithful, miscreants. For them, God does not require to come Himself. But side by side, He does so. If God likes, He can kill thousands of miscreants by one stroke.
So that business does not depend on Him, that He would come to kill a demonic person. The real business is to protect the devotees, the faithful. Therefore Prahlāda Mahārāja says, kṣemāya bhūtaya utātma-sukhāya cāsya vikrīḍitam: "Actually, You have appeared for these persons, to protect them, for their happiness," sukhāya, "and for their elevation."
Just like Bhagavad-gītā, Śrīmad-Bhāgavatam, or Vedic literature, or any scripture. For whom they are meant? Those who are godly, for their elevation, so that they can elevate more and more. It is not for the atheistic persons. They do not believe in God. So Bible or Bhagavad-gītā or Śrīmad-Bhāgavata, they are not meant for the atheistic person. So whatever auspicious things are in the world, they are meant for the faithful, not for the atheistic person.