The mass murder of 22 innocent shoppers at Cielo Vista Mall in El Paso, TX, is an awful event in itself.  But it’s also part of a long and awful history of violent attacks by White Men on Mexicans and Mexican-Americans in Texas. Russell Contreras of the Associated Press has traced that history and the new movement to expose and push back against it.  He’s also traced another historic pattern, racist incitement from the White House.