Guilty until proven innocent
The GOP machine decided long ago that Hillary was guilty. They've spent the past 20 years or so trying to find a crime in order to justify the label, but in their eyes she's guilty anyway. Always was, always will be.
That isn't rational behaviour, but hey, their own candidate is possibly a child molesting serial con artist who also dodges his taxes. Rational people would spot which candidate should be "locked up" within seconds.
(Hint for the utterly blinkered - it isn't Hillary)