Tawnos
A guy with a bass
DS9 needed the adventure to come to them since they were a space station. The war, brought something we had not seen on TNG Or voyager since they were alone.
But it did show a dark side to the federation with the introduction of section 31. Which they used in the rebooted movies.
They needed section 31 to end the war as distasteful as their methods were to the star fleet ideals. But when hundreds of ships have been lost along with all of the lives, they went with it.
Not sure anyone knows what to really do with star fleet moving forward.
It wasn’t just Section 31 doing dark and distasteful things.