Swecker stated that everyone was shocked at the way Comey threw out FBI protocol in the handling of her case including not raiding her residence for the server. Of course, Hillary's I.T. person deleted 30,000 emails before the FBI even got their hands on it when the Hillary camp finally turned it over months into the investigation. Not only servers, but as we know phones were destroyed as well.
He stated that not putting Hillary under oath was shocking. He stated that Comey writing a memo which exonerated Clinton BEFORE interviewing her or key associates involved, was unprecedented.
Swecker stated that he wrote the op-ed because he and other FBI personnel are embarrassed by Comey's leadership and he wants everyone to know that the FBI is supposed to treat everyone the same; that protocols have been in place for a hundred years and they're still applicable to remaining free of politics.
The bottom line is he's so angry at Comey and his book tour because it reflects negatively on all the dedicated employees of the FBI who still believe in integrity.