Sec. Acosta was the lead US Attorney for Florida 10 years ago who agreed to the original plea bargain for Epstein, which allowed him to plead guilty to a relatively minor charge and spend only a little time in county jail, with day release.
The combination of the Miami Herald long-form series on Epstein, which highlighted the hinkey plea deal, and then his recent re-arrest led to many people being extremely mad that he wasn't put away for all this back in 2008 when he was first arrested.
It was somewhat unfair, because the local prosecutors had the lead in the case, and according to Acosta at least, the Florida prosecutors would have let him off without even the minimal jail time he did if he (Acosta on behalf of the Feds) hadn't complained.
None the less the MSM blamed him entirely for the Epstein plea bargain, and went crazy pointing out that he was now Trump's labor secretary. He tried to have a press conference to explain his actions 10 years ago as a US Attorney, but it was too late. The narrative was set.
He was the only going to be a liability to Trump going forward, so Trump accepted his resignation.
The Gov. of Florida has now announced an investigation into the State prosecution of Epstein, and why the sweet plea bargain was cut.
George Papadopoulos tweeted all roads lead to Rome. Hmmmmmm