The attack on two members of the National Guard in Washington last week has shaken the US to its core. The victims were a young woman who gave her life in service to her country and a man now fighting to survive. This violent assault exposed the deep and growing fractures pulling America apart from within. It brought two urgent realities into sharp focus and pushed the nation toward swift and, for some, controversial changes in immigration policy. First, the attack is a stark reminder that radicalism has not vanished.