China’s state-run media quickly seized on the obsessions of their American counterparts over the weekend by linking President Donald Trump to “white nationalism” and blaming gun violence on the large supply of firearms and loose gun laws in the United States. The Chinese Communist Party’s Global Times worked the “white supremacist” angle on Sunday, citing the manifesto left by El Paso, Texas, alleged mass murderer Patrick Crusius: A hate crime is motivated by prejudice, and the victim is targeted because of their social group or race. Many US states have their hate crime laws. However, the number of hate crimes...