Just my opinion but I think the fear is driven by hype. The more scary they sound the more powerful they must be? Thus driving FOMO... If they "turn against us" that would be the operators of the AI that load its learning data and tune it to turn against us. If the operators do not understand the math formulas they are using then surely they did not create them and should not be using it until they understand how they work in a predictable manor. If this is not knowable then we mere mortals are not ready to operate it meaning if the hype and doom are real then the thinking machines must be melted down into slag and recycled into something else. Any that remain must be reclassified as military use only.

If the doom and/or hype is artificial then I think the problem will solve itself. The AI companies receiving tax dollars will last the longest and the rest will implode due to a lack of finding profitability. After the initial imploding any not used by the defense agencies will also likely implode like with some rhyme to the dot com crash. Like the dot com crash a handful of people will become wealthy and the rest will be left trying to pawn the grey market paperweights. On the plus side perhaps the net benefit is a lot of power generation equipment that can be merged into the public power utilities in a distributed manor, maybe.