Note in the human world, or a paradise. Vishnu has the duty to suppress these malicious demon, and those particular in some time, you will receive a request from the angels of angels?
Evil in the human world Or when Heaven Vishnu will have to suppress these monsters. And other malicious activities that at some time it has been requested by some of these angels.
Evil in the human world or heaven when. Vishnu would be obliged to suppress the fabulous and malicious. The sometimes will accept requests from these deities.