You've somewhat made the opposing point right there, "what would HE be?", not "what would the MAQUIS be?"
You're absolutely right, joining a greater cause CAN be admirable, but only if it's the right cause for the right reasons, otherwise you are just engaging in violence in order to feel better about yourself. When you pick up a gun people die, not necessarily at your hands but also as a consequence.
I've some sympathy for the Maquis whilst ultimately disagreeing with them. Forced relocation is a terrible thing, but the federation was making a deal that would prevent them having to fight a bloody war, not out of fear of losing (they wouldn't) but out of fear of doing damage. Eddington wasn't even one of the people being relocated. Billions of people on both sides could easily have been killed had he provoked a war just to avoid being "just another security officer".
To an extent Sisko came out of it pretty badly too. It was all rather personal and instead of the whole affair being two men obsessed with opposing ideals it was two men obsessed with Michael Eddington.