“Comey was worried that if he did not release info about the Weiner emails, anti-Clinton FBI agents in New York might leak them.”

https://www.publicnotice.co/p/comey-indictment-trump-doj-weaponization

Good background on Comey’s mistake. The deeper cause was not Comey though – to produce a Trump candidate the nation had to be ill.

“Everything he hoped to achieve by palliating the GOP — personally, politically, institutionally — has failed. He destroyed himself and everything he cared about.”