Sure the Baku might have told Picard it was voluntary on the exiles part, but remember that statement was coming from a group who wouldn't step aside to let many billions prosper from the particles that they wished to hoard for themselves.
They didn't hoard the particles for themselves. They were just living there.
wow, you really do interpret things in the most charitable manner for the Baku, don't you? I notice that when the battle began in the movie, the leaders of the Baku didn't exactly jump on the idea of calling the whole thing off in order to share the resources of the planet.
As T'Girl pointed out, the reason we didn't see a scene where the Baku explicitly reject resettlement elsewhere to enable the sharing of the resources was because it would've made them even less sympathetic than they already were.
there's a reason why they didn't go public about what they found on the planet when they crashed their three hundred years ago.
Go public? Go public where?
And then, they were escaping a planet that was in a war, hiding inside a nebula. I guess they did that in order not to be traced.