Think about it, mabey the arilou are useing us for somthing, just we never get to figure out what, now that you medtion it, they want to protect us... protect us from what? it cant be the ur-quan thats for sure mainly cause they dissapper after the slave shield went up over earth, this is one mystery we never get to figure out
this is what SC3 explained mostly
I know what it says in SC3 but I like to ignore SC3 as much as I can get away with, though I do use it in some of my theories on occasions.
While I know most of the SC fans discount SC3, I would never have discovered the SC series without it. It was given to me as a present one year, I believe... anyhow, back to the point. My personal opinion reflects fairly closely that of what SC3 illustrated as being their true intentions towards humanity. Much of their behaviour seems manipulative... for instance, the Portal Spawner (or is it the HyperWave Caster, I can't remember?) that they give you so far into the game... why not just show up at the beginning and hand it to us then? It seems to me like they only help us when it benefits them... if I may make a comparison to what I perceive the Airlou to be: the Taelons from Earth Final Conflict... they appear to us claiming to be friends, but at the same time are trying to manipulate us and shape us into tools to serve their purposes.