100 Faults a day - Krishna and Sisupala - What is the need of Krishna to pardon Sisupala 100 faults a day?

coz lord Krishna give the promise to his masi of krishna (mother of sishupal) is and sishupal and dantwaktra is the jay and vijay door keeper of vainkuth lok so the time of sishupal is over on earth and lord krishna is wait for perfect time for his mukti