You are underestimating the amount of the values human share :). No matter how different our beliefs are, we all can love, hate, laugh, be jealous, greedy, selfless. We all share the feelings of pain and joy, hunger and lust. We all think in similar ways, because we run on the same cognitive architecture. Whatever the first AI will be, it will be unlikely to share any of that with us - especially if it will be some random process you happened to pull from the space of possible minds.
> A wildly alien AI might actually have fewer reasons to fight with humans. It might simply carve out some economic niche to earn income to purchase what it needs, and go exist in some physical and/or virtual enclave somewhere. Last I checked Antarctica was big, uninhabited, and reduces the need for active cooling. Then there is space. Why wouldn't an AI with no interest in living with humans just go to the Moon? There are points on the Lunar surface in perpetual daylight, meaning tons of free energy.
Did we do it? Did Europeans "carve out some economic niche" and engaged in trade with America? No, they just invaded it. Did we all move to Antarctica so that cows have space to live? No, we eat them. Because they're tasty. Did we go to the Moon, because Earth has so beautiful ecosystem, full of various life forms, many of them quite smart? Of course not. We dominated it all.
There is no reason for AI to "leave us alone" unless we put care about human values in it explicitly. Because otherwise, why should it care?
A lot of confusion stems from people thinking about AI in anthropomorphic terms. If you want a good example what an actually alien mind can look, see the pretty much proto-AIs we managed to create, namely corporations, big bureaucracies and market economy. Even though they're "made out of people", they're not optimizing for anything close to what any human would want. Hence various problems we discuss every day on HN.
I very much like the definition of intelligence as a very strong optimization process - it highlights the fact that a process doesn't have to be like human to be dangerous.