A chorus of right-leaning tech and business leaders, led by X owner Elon Musk, used their online megaphones in the wake of Saturday’s attack to criticize the Secret Service’s diversity initiatives, condemn Democratic donor Reid Hoffman, and make unsubstantiated allegations about the shooting. The claims by powerful business leaders with large online followings helped influence the direction of platform itself, as well as the storylines viewed by millions of people. Musk’s post endorsing...