The Base Assumptions undergirding all AI safety research is that:
1. AI systems respond to incentives, not commands, including incentives you did not intend to be there.
2. The technology will eventually outsmart its creators, making the imposition of reactionary controls difficult or impossible.
#1 was a good bet, and has already been proven with existing ML systems. In fact, it's one of the most common training blunders you can do and there are countless examples of artificial stupidity coming about from poorly thought-out incentives. AI are ruthless optimizers that will find the loopholes in your systems and maximally exploit them[0].
#2 implies significant harm if we get it wrong (and according to #1, we will always get it wrong). It is very plausible that AI will exceed human capability in at least some tasks, since there are already problem domains where AI dominates (e.g. chess, Go, etc).
My main objection to #2 is that the idea of a new structure or machine that exceeds human intelligence is not novel. Humans evolved to live in small tribes of no more than 100 people and we have not exceeded that limitation. So we're already several nested singularities deep[1] and humanity has not yet been destroyed.
On the other hand, humanity itself is a singularity: the system that created us (genetic evolution) is not capable of effectively controlling us anymore. We control it, and have been doing so since the dawn of agriculture. And we can see the harms that we have done to nature in pursuit of our own goals. So it's not irrational to extrapolate and see how an AI with more intelligence than us can do more harm to us.
[0] So are human children, but they do not have the I/O capability of a data center full of A100s.
[1] Agriculture beget civilization, which beget nation-states, which beget corporations, which beget computers. Each one is a singularity unto it's creators.