Alejandra Caraballo is used to seeing anti-transgender hatred. As an L.G.B.T.Q. rights advocate and a transgender woman, she has received death threats, and her and her family members’ personal information has been published. When she goes to her favorite bar in New York, she sometimes wonders what she would do if someone came in shooting. But last weekend, it became too much. Members of the Proud Boys and other extremist groups, many of them armed, converged outside a planned drag event in Columbus, Ohio. Neo-Nazis protested another event in Lakeland, Fla. There was an anti-L.G.B.T.Q. rally in South Florida, also attended by the Proud Boys. All of this just two weeks after the killing of five people — two of them transgender, a third gay — at an L.G.B.T.Q. club in Colorado Springs.