Kudos to those who kept this thread on the right track while I was away.
Anyway, lets try to rerail this a little. A few of the main sticklers are
1. Human population and what to do with them.
2. Defeating the humans.
3. Soul energy.
4. Test-tube babies.
5. Government and leaders.
1. We should most certainly find a way to cripple Earth's governments by any means necessary, as none of them will like the idea of giving up their control, and I'm betting they would make trouble for us even if we did decide to leave Earth alone completely. They're assholes like that. After we succeed in this, we will be capable of dealing with the rest of Earth's inhabitants and resources in a much more peaceful and efficient manner. All we should focus on is the best way to bring about this crippling, and stealing their oil is definitely a good start to that.
The question is, just how do we plan to drink Earth's milkshake?
2. Once the governments are down, it's just a matter of getting them to stay down. If things are carried out properly, I actually doubt it would be that hard to win over a good portion of Earth's population from overthrowing their governments alone. Personally, I'd like to inherit the earth, rather than obliterate it.
3. I see no reason why we should assume that being used as an energy source would qualify as "torture" for a soul, we still have no presented evidence to suggest they can even feel pain. Remember, they're supposedly infinite. I'm not sure whether you all grasp just how much "infinite" is, but if this is true, they probably wouldn't even mind the relatively minuscule amount of energy being drained from them in the first place. It's important to keep in mind however that utilization of soul power is a long-term goal, and we will need alternatives until we can get it down to a science. Such as large reserves of stolen oil, for example.
4. Already stated plenty of reasons why our colony should be pro-test tube baby.
5. Would you like to know why I don't do elections? Because it brings the possibility of me having to accept failure. Let me make this perfectly clear:
If I put my own plans on hold to get myself hauled off to a colony on Mars, you can be damn sure I'm going to do everything in my power to ensure its' success. Regardless of who claims to be in power, or holds the superficial title of "President".