Getting drunk on Purim is a mitzva dirabbanan according to some shittos. Viahavta lireacha kamocha is an asay dioraisa according to all. Slandering a seminary is an issur dioraisa too. I guess the mitzvah and chiyuv of getting drunk is so chasuv in his eyes that he feels it is permitted to set aside an asay and also violate a lav to fulfill it.
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