the shem mi’shmuel has a yesod that pesach night is b’chinas geyrus, i.e. rededicating your connection to HAshem. with this he explains why chomez is only assur on pesach, and not the whole year, (since we know that chomez represents the yezer hara etc.). he says that since we are becoming “geyrim” on peysach we need our foundations to be purer than the we would the rest of the year.
with this yesod we can also answer this question. normally, we would draw in the rasha, and try to be mekarev him. but on the seder night we need our foundations to be pure, and we cant stand even a bit of his kefira, so we knock out his teeth and shut him down.