The evidence speaks for itself.
The attached information from business leaders about a plot to kill JFK wasn't pursued by the FBI or the Warren Commission.
FBI Director J Edgar Hoover and President Lyndon B Johnson decided shortly after the assassination that the safest explanation was a lone gunmen acting without foreign or domestic assistance.
The authors of the assassination hoped to blame it on a communist conspiracy. They failed.
Hoover and LBJ perceived danger to domestic and international stability if the true conspirators were revealed.