He's only doing this because he thinks he thinks it's a good way to pepper the narrative for y'all, based on what he knows is coming over the next several weeks.
First and foremost, Comey is hoping that when you're watching his own "friend" and predecessor indict him after all this time, you'll remember when he made sure to clearlu and precisely lay out every federal statute/charge he'd bring against Hillary if he himself had been AG, while looking like he'd swallowed a literal canary when he did a 180 by suggesting no indictment, immediately following his statement, basically indicting her.
Next, he's hoping that as things increasingly heat up and the MSM makes it look worse and worse for him to you, you'll remember that if Strzok, McCabe, etc. fudged some docs, edited some descriptive terminologies, drafted and obtained approvals on a few things Comey had NO CLUE ABOUT, you'll consider that maybe there were A LOT more documents, edits, drafts, requests and approvals submitted that he didn't know about, too. REMEMBER THIS... Strzok is all things "memos" and "documents". He handles the corrupt creation, drafting, editing, doctoring, fabricating, omitting, falsifying, publishing, submitting and falsifying of ALL THINGS REQUIRING OFFICIAL, VERIFIED DOCUMENTATION.
INCLUDING (READ THIS THOROUGHLY) but not limited to...
- Falsifying/generating "official write-ups/supporting documentation" for sections of dossiers completed and sent to orgs like CrowdStrike on "Russian hacking" and "collusion" for fake dossiers.
-Falsifying/generating formal and official FBI Director recommendations and documents to the DOJ/AG and via edits, changes, deletions and manufacturing of such.
-"Personal notes" made to privately document one-on-one side conversations and meetings with Trump that made people feel so unironically "uncomfortable" that they felt compelled to make "side notes" right after. (did anyone really believe this as it was being testified to/said?)...
Now put this together with Gowdy’s view on how history will treat Comey. We might just start to get a picture of what is coming.