I thought I covered it - the anti-hero narrative. The anti-hero can do no wrong and the bad guy (or gal in this case) needs to be stopped at all costs. Therefore going after Hillary was the just and right thing to do and going after Trump is deep state conspiracy.
Where it falls apart it is that it makes no sense that the deep state actors would go after Hillary since Trump is the target of the deep state conspiracy and Hillary is in cahoots with the deep state. To my knowledge nobody has come up with a plausible conspiracy explaining why the FBI torpedoed Hillary Clinton's campaign and I say "why try?" Just continue to focus on how evil Hillary and everything she represents is and who cares if there are inconsistencies in the narrative.
It's like a Star Wars movie, we accept that Vader doesn't recognize C3PO in Cloud City even though he built and spent his life as Aniken with C3PO. Why doesn't Obiwan Kenobi recognize R2D2 in A New Hope? We accept and ignore these incongruencies because not to accept them would ruin the story. So the Trump supporters conveniently ignore that Hillary's campaign was attacked by DOJ, FBI, etc because to acknowledge it ruins the deep state narrative. And Hillary is such an evil villan, who cares as long the hero (Trump) prevails.