One might argue that all of the Future Guy's acts were to the benefit of the Federation: igniting wars amongst current or future Earth enemies, nudging NX-01 towards places and times where she'd be of the greatest benefit to Earth... Also, when the future Federation goes kaboom in "Shockwave", Future Guy suddenly ceases to exist (or at least ceases to communicate with the Suliban). For all we know, then, FG was a Fed himself.
"Cold Front" is the most aimless temporal war episode of them all, though. It's difficult to assign either sinister or benevolent motivations behind Silik's (or FG's) actions there, or to observe any longterm effects of those actions. One might almost think that FG was constantly out to protect Earth and our heroes, but did this by pretending to be a villain so that Silik would more readily follow him - and that Silik acted on his own in "Cold Front", misunderstanding his role in the greater game.
Timo Saloniemi