James Comey is responsible for this.

[Stargleamer]

5. Yes, they did

and his purported justification for doing this was that if he didn't, such "concealment" would have hurt the FBI's reputation. This justification (even if totally sincere and not self-serving--a big if) is based on a very faulty perception that the public would feel the FBI had been derelict in its duties if such a re-opened investigation was not publicly announced. There is nothing to indicate that would be the case, so he shouldn't have brought it up at all. If he was concerned about the FBI's reputation, he could have at least announced both ongoing investigations into Hillary's e-mails as well as Trump's Russia's ties. He didn't do that either, so he chose deliberately to hurt Hillary's chances while increasing Trump's. He's to blame for why Trump is president.

That being said, it was still Trump's voters who ignored all the things he did (Trump University, sexual abuse/molestation of girls and women, disparaging Mexicans, mocking a disabled reporter, etc., etc., etc.,) while thinking (or acting as if they did) that Hillary's e-mails were somehow a greater scandal. They're the ones who ultimately bear a greater share of the blame than Comey does.