The assassination attempt unfolded in the vicinity of hundreds of reporters. Surveillance footage of the alleged gunman racing through a checkpoint was publicly released. Administration officials gave press conferences and provided information about the events. And yet, minutes after authorities say a lone gunman tried to attack the White House correspondents’ dinner on Saturday, cries of conspiracy began lighting up social media. Some X accounts zoomed in on President Donald Trump’s face when shots rang out, finding his lack of apparent fear suspicious. Others questioned how security at such a major event could be so poor. Some even jumped on press secretary Karoline Leavitt’s remark prior to the dinnertime speeches that some “shots” would be fired. Many pointed out that Mr. Trump and his allies used the hours after the shooting to demand that his White House ballroom, which faces legal hurdles, be built for security reasons.…