Krsna is so merciful that He always thinks of how to liberate the conditioned souls from the material platform. It is for this reason that Krsna incarnates, as clearly indicated in the Bhagavad-gita (4.7):

"Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion-at that time I descend Myself."Krsna always protects the living entities in many ways. He comes Himself, He sends His own confidential devotees, and He leaves behind Him sastras like the Bhagavad-gita Why? It is so that people may take advantage of the benediction to be liberated from the clutches of maya. Sri Caitanya Mahaprabhu accepted sannyasa so that even a foolish person who accepted Him as an ordinary sannyasi would offer Him respect, for this would help diminish his material distresses and ultimately liberate him from the material clutches. Srila Bhaktisiddhanta Sarasvati points out in this connection that Sri Krsna Caitanya Mahaprabhu is the combined form of Sri Radha and Krsna (mahaprabhu sri-caitanya, radha-krsna-nahe anya). Therefore when fools considered Caitanya Mahaprabhu to be an ordinary human being and thus treated Him disrespectfully, the merciful Lord, in order to deliver these offenders, accepted sannyasa so that they would offer Him obeisances, accepting Him as a sannyasi. Sri Caitanya Mahaprabhu accepted sannyasa to bestow His great mercy on people in general, who cannot appreciate Him as Radha and Krsna Themselves.