No offense, but if you didn't see a threat present itself then you werent paying any attention. The station constantly alludes to the fact that it will have no more use for you after it's complete.
I was paying attention, but saying things such as "it has no use for me" or that it will "take over the universe" or whatever else doesn't seem like a threat when the machine's only job is to produce power and say "scary" ai things.
