The danger of AI isn't that it's suddenly becoming evil and taking over the world. That's an antropomorphization. The danger is that AI might give tremendous amounts of power to individuals, and I mean unchecked power. Trump is the most powerful person in the world and he has the nuclear codes but if he's freaking out and yelling "NUKE WASHINGTON DC AND ALL THE FAKE NEWS REPORTERS IN IT" at the top of his voice then there is a likely chance that officers will refuse orders. If an AI gave a "mad scientist" this amount of power, it might not refuse the orders but execute them.