Yep, Einstein was an expert in his field who wrote a couple of ground-breaking papers in his field. As far as I can tell no-one who is an expert in AI (or even similar fields) is worried at all about super-intelligence.
Literally everybody who is an expert in AI is worried about how to manage super-intelligence. The standard introductory text in AI by Russell and Norvig spends almost four pages discussing the existential risk that super-intelligence poses. The risk is so obvious that it was documented by IJ Good at Bletchley Park with Turing, and I wouldn't be surprised if it were identified even before that.
You haven't thought much about the risk of superintelligence if you think it is a typical risk. Is that compared to poorly designed children's toys or nuclear weapons?
I would go as far as to say, "humanity" as it is defined today, is doomed, it is just a matter of time.
The only question is: Will doom play out with a dramatic disaster or as a peaceful handoff/conversion from biologically natural humans to self-designed intelligence.
Either way, natural human beings will not remain dominant in a world where self-interested agents grow smarter in technologic instead of geologic timescales.
