An AI smart enough to defeat all of humanity, if all of humanity coordinated to stop the AI.
An AI smart enough to defeat an institution as powerful as the United States, if the US coordinated to stop the AI.
An AI smart enough to defeat an institution as powerful as Google + OpenAI, if they coordinated to stop the AI.
Etc.
If humanity manages to muster only a fraction of our power to oppose a particular AI system, the AI system might win that contest without being as smart as the first item in the list.
Consider the subtle difference between:
An AI smart enough to defeat all of humanity, if all of humanity coordinated to stop the AI.
An AI smart enough to defeat an institution as powerful as the United States, if the US coordinated to stop the AI.
An AI smart enough to defeat an institution as powerful as Google + OpenAI, if they coordinated to stop the AI.
Etc.
If humanity manages to muster only a fraction of our power to oppose a particular AI system, the AI system might win that contest without being as smart as the first item in the list.