They have no logistical requirement to speak of and they spawn infinite aliens from basically nothing. There is no thinking other than, bomb their nests, stop them from spawning.
It would be interesting if aliens has to work for their strength and build actual bases. i would have them mine, transport, and decide what to produce.
Then, as a player, we would be able to decide strategically how to response to those bastard aliens stealing his iron and copper.
For example, bomb their transport network, production facility, smelters....a true industrial war.

Hey, I think it would turn factorio into a grand strategy game.