“Repeal the Second Amendment.” That’s the recommendation of retired Supreme Court Justice John Paul Stevens, writing in a New York Times op-ed published Tuesday. In the piece, he praises the youth protesters who staged Saturday’s massive worldwide marches, the March for Our Lives. He also writes, “a constitutional amendment to get rid of the Second Amendment would be simple and would do more to weaken the N.R.A.’s ability to stymie legislative debate and block constructive gun control legislation than any other available option.”