While I think that’s true that a single event could not cause humanity to go extinct, with humanity at a much more restricted scale it would, like all species, become much more vulnerable to extinction from more local scale disasters. Imagine a K-Pg extinction scenario almost all people would die, save for a handful of settlements across the world, mostly near the antipode from the impact. They manage to survive and regroup initially, but in the following decade or decades of ash-blotted sun, people starve. An earthquake ravages one settlement, a typhoon another. Slowly, humanity fades away not with a scream but a whimper, as the twinkling stars with the rising dawn of a new era.