> But here we are, thousands of years later,

Not like there was a general lack of tragedy, pain, suffering, war, chaos in the intervening thousands of years.

Seems so superficial to ignore everything and just say if we're here, we exist, then the claim that things will go bad is proven false. The only thing proven false is if anyone ever claimed humanity will be extinct. But think of all the suffering in all the wars between the roman empire and now. Is that nothing? Does that not qualify as very bad stuff? Did humanity advance continuosly, or was it a chaotic path, with ups and downs? Don't the downs qualify as what the complainers predicted?

To me it seems history teaches us we will survive as a species. But there is definitely a lot of room for very bad stuff to happen. It has happened before.