Probably because in a bad society, people wouldn't be happy and success would be rather hard. Gorgias was a skeptic. He gave up an illustrious career in philosophy to become a teacher in rhetoric. If anything exists, it is unknowable. If it is knowable, it cannot be communicated.
Nothing exists, ever.
I believe that science will soon discover that all things are made up of energy. You are energy. I am energy. That rabid dog over there who is about to bite you is made of energy. So is that tree, and that cloud.