The way I see it is that the existential risk comes from humans losing control. Here is a very abstract argument for why AI is relevant here. Right now, there

The way I see it is that the existential risk comes from humans losing control. Here is a very abstract argument for why AI is relevant here. Right now, there is no central entity that has supreme control. Rather, humanity is guided by a hierarchy of organizations made from individual humans. The decisions and behavior of these organizations is determined by both the desires and needs of individual humans (basic needs, status, community), as well as dynamics acting directly on organizations (competition for survival, selection pressure for increasing control over resources). The system is in a somewhat stable equilibrium because no organization can achieve domination due to a balance of power and due to many individual humans not wanting that to happen. AI does two new things. First, it allows for potentially immortal agents which have much completely stable goals, which they will pursue with no regard for anything else. This is something individual humans cannot come even close to. Organizations can come closer but still not that close. Second, fast progress in AI allows for a temporary large imbalance of power. In particular, AI has the potential to enable scalable and effective technologies for monitoring and controlling humans. Using such means, an organization (whixh then naturally ends up partially controlled by AIs) may outcompete others and consolidate control. The danger is that this consolidation may be completed for the first time in history. No organization has ever achieved world domination, though a few have come somewhat close. I would say one of the strong factors that prevented this from happening was the difficulty of maintaining the organization's goal of domination, while influential people die, change their minds or pursue their own goals above those of the organization. Systems involving human organizations have slack. Systems of organizations made up of or controlled by AIs may be very different. The crucial point for the "existential" part of the existential risk is that we all used to believe world domination is obviously impossible. This must be carefully reevaluated with AI entering the picture. Even a small danger is worth considering and large mitigation efforts because a failure may be permanent and irreversible.