I always wondered to what extent Sisko confessed to being party to the senator’s murder and Garak’s involvement to Starfleet?What I'm saying is, Section 31 didn't think of it and didn't come up with a plan, Sisko did. He wouldn't call them up for their help because he hates them and wants them shut down, and he didn't need them.
Also:
"SLOAN: We don't submit reports or ask for approval for specific operations, if that's what you mean. We're an autonomous department. "
"SISKO: Starfleet Command had given the plan their blessing and I thought that would make things easier. But I was the one who had to make it happen."
Bit of an important distinction.
Did he file a confidential report explaining the entire thing?
Or did he just report back the senator left the station not convinced of the forgery, and the entire situation was ambiguous enough that no one in Starfleet could know for a certainty Sisko and Garak had engineered the bombing?
I always felt like the confession into his personal log is him trying to work through it himself to figure out what it means for his character as a person and whether it was worth it. It doesn’t feel like a guy who’s talked to anyone beyond Garak about it, in the way he shows shame and bursts of anger when he’s talking to the audience.
And in trying to justify it, at the end when he says “I can live with it,” it’s him realizing that for the murder to have any meaning and to live with it means living with the lie. In my head, that’s the reason he deletes the log and probably never tells another soul beyond Garak the full extent of what happened.