The FBI has been conducting a thorough investigation of Thomas Matthew Crooks, the 20-year-old gunman who attempted to assassinate presumptive 2024 GOP presidential nominee Donald Trump during a campaign rally in Butler, Pennsylvania on Saturday afternoon, July 13. Crooks, who was killed by U.S. Secret Service agents, didn’t have a strong online presence. The gunman was a registered Republican, yet made a small donation to a progressive group. And his motivations for the Butler attack remain a mystery. During an appearance on The New Republic’s podcast, journalist/author Zack Beauchamp warned …