It is because Purim commemorates the literal survival of the Jewish people to this very day that the sages wanted to make sure we celebrate accordingly.
Drinking is a well-known feature of the Purim holiday. This is largely based on the Talmudic teaching that “one is obligated to drink on Purim until he reaches the point that he cannot tell the difference between cursing Haman and blessing Mordechai.”
Fortunately, for this writer, this statement of the Talmud is codified as law in the Code of Jewish law thereby truly requiring us to drink on Purim!
Nevertheless, there are a number of different interpretations as to the extent that one must drink on Purim. Drinking to the point that one “cannot tell the difference between cursing Haman and blessing Mordechai” seems to be a little extreme according to some.