The native American thing isn't analogous to paperclipping because they weren't exterminated as part of a deliberate plan.
The alien encounter thing isn't all that analogous, either. It makes a little sense for paperclippers to take resources from humans, because humans are at least nearby. How much sense does it make sense to cross interstellar space to take resources from a species that is likely to fight back?
The ready made economic answer to intra species conflict is to make use of the considerable amounts of no-mans-land the universe has provided you with to stay out if each other's way.
Kicking the can down the road doesn't seem to be a likely action of an intelligent civilisation.
Best to control us while they still can, or while the resulting war will not result in unparalleled destruction.
If it's worth saying, but not worth its own post, then it goes here.
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