There already is a real life Purge - it's called Abortion
I love seeing liberal commentators talk about The Purge with glee as they draw comparisons to Donald Trump's election campaign, as if this is what conservatives want to implement. The truth is, the liberals have already instituted a Purge: and it's called abortion. Think about it: abortion is used very disproportionately by the poor, underprivileged, and minorities.
Going further, a dirty little secret liberals like to ignore is that the founder of Planned Parenthood, Margaret Sanger, was a racist who wanted to use birth control as a means to eventually weed out inferior races. Well, her vision has been carried out! It may as well been a Margaret Sanger clone, or the current head of Planned Parenthood, acting as the New Founding Fathers of America. They are the ones "cleansing" America in real life.