1. Exterminate doesnt actually exterminate the population it just reduces it to 1 mill.
If I'm not mistaken, this is to prevent you from losing colonies due to reducing the total population of the planet to zero.
However, I do think it would be nice to have a third policy group of "Enemy Races", which is basically any race your currently at war with.
I foresee funny issues with this. "We the people of the Human Galactic Empire have made it a policy to exterminate citizens who are members of a species which dominates the factions that we are at war with. Since we are currently at war with the Human Galactic Republic, we ask all humans to report to the nearest extermination centers for immediate liquidation." Oops, I just killed off the population of my core worlds, including the homeworld ...
That, or I'm trying to build up a population of Quameno to get their science bonus into my empire and have the "exterminate enemies" population policy, and I get into a war with the Quameno Technocracy. Where did all those Quameno go? Oh, er, um ... oops? I don't think "we're sorry, guys, it was an accident" is going to work to bring them back into the fold.
< Message edited by Aeson -- 6/15/2014 6:49:00 PM >