A sociology professor at Trinity College is defending his use of the hashtag #LetThemF**kingDie in a Facebook post calling for racial minorities to “put end to the vectors” of whiteness, after the post prompted the Hartford, Conn., school to close for security purposes last Wednesday.

The post, which was published by Professor Johnny Eric Williams after the shooting at a Congressional baseball practice in Northern Virginia on June 14, read: “It is past time for the racially oppressed to do what people who believe themselves to be ‘white’ will not do, put end to the vectors of their destructive mythology of whiteness and their white supremacy system. #LetThemF–ingDie.” The hashtag was in reference to a Medium article Williams posted that discussed the officers who saved the lives of GOP congressmen during the shooting by contending, “Saving the life of those that would kill you is the opposite of virtuous. Let. Them. Fucking. Die.”