Whenever there are references to the avataras, religious principles are established, and demons who are against Krsna are killed. The Krsna consciousness movement is spreading all over the world with two aims — to establish Krsna as the Supreme Personality of Godhead and to kill all the pretenders who falsely present themselves as avataras. The preachers of the Krsna consciousness movement must carry this conviction very carefully within their hearts and kill the demons who in many tactful ways vilify the Supreme Personality of Godhead, Krsna. If we take shelter of Nrsimha-deva and Prahlada Maharaja, it will be easier to kill the demons who are against Krsna and to thus reestablish Krsna's supremacy. Krsnas tu bhagavan svayam: [SB 1.3.28] Krsna is the Supreme Lord, the original Lord. Prahlada Maharaja is our guru, and Krsna is our worshipable God. As advised by Sri Caitanya Mahaprabhu, guru-krsna-prasade paya bhakti-lata-bija [Cc. Madhya 19.151]. If we can be successful in getting the mercy of Prahlada Maharaja and also that of Nrsimha-deva, then our Krsna consciousness movement will be extremely successful.

From Srila Prabhupada's purport to SB 7.10.42