This material world is so nuisance place that . . . just you have got a very nice example: just like Jesus Christ, Lord Christ. So what was his fault? But the sura-dviṣām, the envious person, killed him. And if we find, if we analyze, what is the fault of Jesus Christ, there is no fault. The only fault he was preaching about God. And still we find so many enemies. He was cruelly crucified. So you'll always find this, sura-dviṣām. So Kṛṣṇa comes to kill these sura-dviṣām. Therefore vadhāya ca sura-dviṣām. These envious persons are killed.
But this killing business can be done without the presence of Kṛṣṇa. Because there are so many natural forces—war, pestilence, famine, anything—just set on working. Millions of people can be killed. So Kṛṣṇa does not require to come here to kill these rascals. They can be killed simply by Kṛṣṇa's direction, nature's law. Prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ (BG 3.27). Sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā (Bs. 5.44). The nature has got so much power that it can create, it can maintain, it can annihilate, dissolute, everything. Nature is so powerful. Sṛṣṭi-sthiti-pralaya. Sṛṣṭi means creation, and sthiti means maintenance, and pralaya means destruction. These three things nature can do.
Just like this creation, material creation, is natural, nature, cosmic manifestation. It is being maintained. By nature's mercy we are getting sunlight, we are getting air, we are getting rains, and thereby we are growing our food, eating nicely, growing nicely. This maintenance also being done by nature. But at any time everything can be finished simply by one strong wind. Nature is so powerful. So for killing these demons, nature is already there. Of course, nature is working under the direction of Kṛṣṇa. Mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram (BG 9.10). So if Kṛṣṇa says that these demons may be killed, then nature's one blast, one strong wind will . . . can kill millions of them. So for that purpose Kṛṣṇa does not require to come.