Of course, the idea that the President’s head can just explode for no reason in view of the public, and by implication, so can anyone else’s at any time, is far more existentially terrifying than any assassination plot, so, to avert mass panic and social collapse, the FBI hurriedly framed some local weirdo, and then killed him before anyone could flag that he probably had nothing to do with it, which is the only reason why everyone’s life savings still had any value afterwards.