http://edge.org/conversation/jaron_lanier-the-myth-of-ai
"This notion of attacking the problem on the level of some sort of autonomy algorithm, instead of on the actuator level is totally misdirected. This is where it becomes a policy issue. The sad fact is that, as a society, we have to do something to not have little killer drones proliferate. And maybe that problem will never take place anyway. What we don't have to worry about is the AI algorithm running them, because that's speculative. There isn't an AI algorithm that's good enough to do that for the time being. An equivalent problem can come about, whether or not the AI algorithm happens. In a sense, it's a massive misdirection."
There seems to be this leap from 'superintelligent AI' to 'omnipotent omniscient deity' which is accepted as inevitable by (what for shorthand here is being called the 'lesswrong' worldview) which seems to ignore the fact that there are limited resources, limited amounts of energy, and limitations imposed by the laws of physics and information, that stand between a superintelligent AI and the ability to actuate changes in the world.
You might decide that this means edanm goes off the rails at step four, instead. But you should at least understand where you disagree.
I would think it relatively easy for a human armed with today's knowledge and a reasonable yet limited resource infrastructure (for comparison to the situation of an unguarded AI) to quite easily engineer the demise of primate competitors in the neighborhood. Set some strategic fires, burn down jungles would be the first step. "Fire" might be a metaphor for some technology that an AI might master that humans don't quite have the hang of yet that can be used against them. For example, a significant portion of Americans seem way too easily manipulated by religion and fear, an AI-generated televangelist or Donald Trump figure might be a frightening thought.
"whatever the goals of the AI will be, it will achieve them". Dude, if intelligence meant you could achieve your goals, Hacker News would be a much less whiny place.