"AI" is one of two things depending on whether you think it's actually intelligent:
* If "AI" is actually intelligent, then it's no worse a threat than any living being known to man.
* If "AI" is not actually intelligent, then it's no worse a threat than any other computer program.
Both threat models are very thoroughly known and understood. I second parent commenter's sentiment that calling "AI" the "gravest of dangers" is a gross misrepresentation.
* If "AI" is actually intelligent, then it's no worse a threat than any living being known to man.
* If "AI" is not actually intelligent, then it's no worse a threat than any other computer program.
Both threat models are very thoroughly known and understood. I second parent commenter's sentiment that calling "AI" the "gravest of dangers" is a gross misrepresentation.