2. Helping Humanity Got Prometheus in Hot Water With Zeus
Although he had helped the Olympian gods secure victory against the Titans, Prometheus eroded his store of goodwill with them when he took the side of humanity against that of the new deities. He ticked off Zeus and got on his wrong side when he tricked him to accept the bones and fat of sacrificial animals instead of their meat. That set a precedent that allowed humans to sacrifice animals to the gods by burning their bones and fat but got to keep the meat for themselves.
In response, a peeved Zeus took fire away from mankind and wiped its secret from human minds, so they would have to eat meat raw and shiver from the cold in the dark of night. To make his pettiness stick, the chief god prohibited anybody from letting humanity in on the secret of fire. Prometheus however defied Zeus and stole fire from Mount Olympus, then smuggled it down to earth to share with mankind and help them survive life’s struggles. That was the final straw for the chief Olympian.