Sometimes good can come out of tragedy. So it seems that in the wake of the assassination of Charlie Kirk this country might finally come to terms with certain violent extremist groups in our midst. On Wednesday, President Trump said that he was willing to designate Antifa (“a sick, dangerous, radical left disaster”) as “a major terrorist organization.” The move cannot come soon enough. Despite the claims of Jimmy Kimmel and others, it is clear that the sick young man who assassinated Charlie Kirk last week was not a “MAGA Republican.” He is a young man from a Republican family...