“It’s time to cool it down,” President Biden said Sunday night in a rare Oval Office address after Saturday’s attempted assassination of former President Trump. He spoke for about six minutes. Standout lines: “We do not know the motive of this shooter yet. We don’t know his opinions or affiliations. We don’t know whether he had help or support. … Tonight, I want to speak to what we do know. A former president was shot, an American citizen killed while simply exercising his freedom to support the candidate of his choosing.””Violence has never been the answer,” Biden said, going on to give exa…