Just got GalCiv IV.  Getting to grips with it...

I'm a homemade synthetic Yor type species.  I conquer a planet.  It is full of organic unhappy citizens.  They're VERY unhappy.  Mostly because their own AI government foolishly picked a fight with me, while at the same time overpolluting.  And now their problems are mine.  It seems there is nothing I can do about them.  They won't leave on their own, and I can't seem to kick them out, or exterminate them.  Yes, ethic cleansing is bad IRL, but the whole point of being synthetic is that I don't have to deal with this crud.  My whole civilization is based on not needing food for example.  Their planets are almost completely unproductive because of their unhappiness.

It's ruining the game....  Advice??