Part of the danger of AI (general ) is that it may have no self motivation, but just optimisation. The classic hypothetical is an AI optimised to make paperclips. Left alone, it might reduce the entire Earth to paperclips.
On the other hand, if true conscious AI emerges, whether it be benign, indifferent, or malicious could be threatening to humans. The corresponding scenarios are depicted in the movie "I Robot", the "landscaper indifferently crushing ant hills", and "The Terminator" movie scenarios, correspondingly.
The common danger being variations of loss of control, including ending up controlled under an impossibly great IQ disadvantage.