Ah, this was The Maquis
. Well, a high-ranking Starfleet officer defects. What the hell should the Federation do, just idly sit by? Of course they will go after him, he is a defector and possible a traitor.
Still waiting for the arguments that points out how the actions of the Maquis serve the goal of peace.
I already made my point, peace treaty plus decent monitoring do the trick whereas attacking the Feds or the Cardassians doesn't. Fighting against the bullies on the schoolyard is heroic but if it doesn't end their nastiness it is pointless in the long-run.