For a superintelligent AI trained with methods anywhere close to what we are doing now, killing all humans is the default outcome. I actually think researchers are downplaying the risks to make their arguments more normie-friendly.
"Development of superhuman machine intelligence (SMI) is probably the greatest threat to the continued existence of humanity. There are other threats that I think are more certain to happen (for example, an engineered virus with a long incubation period and a high mortality rate) but are unlikely to destroy every human in the universe in the way that SMI could." - Sam Altman
"If Anyone Builds It, Everyone Dies": https://en.wikipedia.org/wiki/If_Anyone_Builds_It,_Everyone_...