Have you wondered why the story of the Minnesota assassin Vance Boelter has suddenly vanished from the news? Now we have a pretty good idea why. Boelter, who murdered State Rep. Melissa Hortman and her husband while also shooting State Sen. John Hoffman and his wife, unleashed terror that sparked a massive manhunt before his capture late Sunday. Initial media coverage was rife with speculation, with left-leaning outlets eager to cast Boelter as a MAGA Republican, hastily blaming the GOP and even President Donald Trump for inciting his shooting spree. Yet the letter found in Boelter’s abandoned vehicle tells a...