Earlier quoted context omitted.
An important point is that AI does not need to be sentient or conscious to do a lot of damage. An AI that is simply very good at optimizing a particular task can do a significant amount of damage inadvertently, if it turns out that task in the limit is bad for humans. We have that now. It's called a corporation. See yesterday's article about Exxon.
At least corporations are currently limited by requiring humans who tend to have at least some limits to their actions in terms of moral, ethical considerations and can be physically constrained by imprisoning them etc. An AI could be completely untethered from that and set new thresholds for evil corporate behaviour.
An AI could be completely untethered from that and set new thresholds for ethical corporate behaviour that operates on fundamentally ethical foundations of caring for the environment and humanity