This is the business of Krsna, two-sided business: one side killing the demons, another side giving the protection to the devotees. So Sri Caitanya Mahaprabhu appeared on this part 488 years ago to hand the same two principles, paritranaya sadhunam vinasaya ca duskrtam. He killed Jagai-Madhai not by the body, but stopped their atrocious activities. So Sri Caitanya Mahaprabhu’s mission is to kill the demon — not by life but by their heinous activities. Anyone who comes to be killed by Sri Caitanya Mahaprabhu, his heinous, nefarious activities becomes killed and he becomes a Vaisnava, just like Jagai-Madhai.
At the present moment, the whole world is full of Jagai-Madhai, their four principles. Jagai-Madhai means illicit sex, meat-eating, intoxication and gambling. This is Jagai-Madhai. So this movement, Krsna consciousness movement, is killing these Jagai-Madhai principles: no illicit sex, no intoxication, no gambling and no meat-eating. So one side, killing the Jagai-Madhai principle, and other side protection, chanting Hare Krsna maha-mantra.
From Srila Prabhupada’s lecture on Sri Caitanya-caritamrta, Adi-lila 7.3 – March 3, 1974, Mayapur