Yes, let's be careful here.
The AI's that might actually exist in the future are those that had their origins in human-designed computer programs. Right? If an AI exists in 2050, then it was designed by something designed by ... something designed by a human.
Is this really a random sample of all possible minds? I find it conceivable that human-designed AIs are a narrower subset of all the things that could be defined as minds. Maybe, to some extent, any "thinking machine" a human designs will have some features in common with the human mind (because we tend to anthropomorphize our own creations.)
The claim that "Any human-made AI is unlikely to share human values" requires evidence that human values are hard to transmit. Compared to, say, features resembling human faces, which we instinctively build into mechanical objects.
Pretty much everyone I know can doodle a set of features that are recognizably a schematic of a human face; they can even doodle a variety of sets of features that are recognizably different schematics of different expressions.
A great many people can reliably produce two-dimensional representations that are not just schematics but recognizable as individual human faces in specific contexts.
Even I, with relatively little training or talent, can do this tolerably well.
By contrast, I don't know many people who can reliably capture representations of human values.
That certainly seems to me evidence that human values are harder to transmit than features resembling human faces.
Here is another example of an outsider perspective on risks from AI. I think such examples can serve as a way to fathom the inferential distance between the SIAI and its target audience as to consequently fine tune their material and general approach.
via sentientdevelopments.com
This shows again that people are generally aware of potential risks but either do not take them seriously or don't see why risks from AI are the rule rather than an exception. So rather than making people aware that there are risks you have to tell them what are the risks.