In Relativity there are several versions of him, one of those versions experiened 30 years on Earth and planted the explosive on Voyager
SEVEN: Captain, I believe your future self is suffering from temporal psychosis.
BRAXTON: Well of course I am, you pedantic drone. The only way for me, for us, to recover is to obliterate Voyager from the timeline. That way, none of the events that caused this illness will have occurred.
JANEWAY: What events?
BRAXTON: Thirty years of exile on twentieth century Earth. The temporal inversion in the Takara sector. Three violations that I had to repair