​This is the backdrop Elon Musk has parachuted into, with the grace of a meme lord and the menace of a billionaire arsonist. He has found Britain’s sorest nerve—immigration—and jabbed it with the same glee he once reserved for short-sellers. Grooming gangs, free speech, Tommy Robinson: Musk has taken Britain’s ugliest domestic quarrels and broadcast them to the world, not because he loves Britain, but because chaos is his native language.