Channel 4 handed Jimmy Kimmel its coveted “Alternative Christmas Message” — and he lit a political fuse. In a few furious minutes, he accused Donald Trump of trying to silence him, warned Britain that “tyranny is booming” in America, and described a government threat that yanked his show off the air. Then the crowds came, the network blinked, and the late-night comic turned unexpected free-speech martyr. Now he’s using his second chance to torch a president he says dreams of executions, kingship, and control of the press. His message to the U.K.? Don’t look away. This is how democra… Continues…