How is mankind existing today if Zeus destroyed it after Pandora opened the box?

Zeus never destroyed the race of man. He was considering it, when Prometheus pleaded with him to spare the species (before Pandora's creation). And when Prometheus directly disobeyed Zeus' order to keep fire from humans, Zeus punished him by chaining him to a mountain and setting above him an eagle that would pick out his liver every day. But Zeus was not through with his punishment. He went after Prometheus' brother under the pretense of friendship and forgiveness. Zeus and the other Olympians created Pandora, and they gave to her an ornately designed box, made by Hephaestus. She was told never to open the box. Then the gods mischievously gave her curiOSity. Despite his brother's warnings, Epimetheus accepted the gift. They lived happily together, but Pandora could not keep the thought of the box out of her head. She convinced herself that the gods were only joking when they said not to open it. Pandora believed that there were jewels inside, and the gods were probably offended that she hadn't thanked them yet. So she finally talked herself into opening the box. Once opened, out came all of the Spites of the world: Old Age, Sickness, Labour, Vice, Insanity, Passion. And at the very bottom of the box was the delusive Hope.