Two interacting risk factors enable AI takeover

The most plausible scary takeover scenarios involve two factors interacting: humans not understanding the increasingly AI-mediated world (AIs writing incomprehensible code, running businesses interacting mostly with other AIs), so humans can only optimize on outcomes; combined with this making it easy for AIs, if they coordinate to fail, to do massive harm quickly while humans cannot prepare or mitigate because they don't understand the systems.