A day after a shooting at Crown Center – the bustling Kansas City shopping center often filled with children – injured six, Mayor Quinton Lucas sat on stage with Vice President Kamala Harris, asking questions about the White House’s efforts to combat gun violence. Harris, who has been traveling the country speaking about firearms’ deadly toll, at one point mentioned meeting with a group of middle school students who had either witnessed gun violence or lost a family member to it. The trauma from violence, especially guns, she said, “is very real.” Lucas interviewed the vice president Thursday …