In preparation for Election Day, Manhattan businesses boarded up in case violence erupted if Donald Trump won reelection. They had seen or already experienced destruction during the summer, when George Floyd's and other Black people's death at the hands -- or knees -- of police officers set off both legitimate protests and outright violent riots and looting. Now that Washington, D.C., has become a militarized zone because of the violence that descended on the Capitol building itself -- with both houses of Congress present -- we know that violence is a bipartisan problem. It's a poison in our national bloodstream....