Because of a curse Athena put on her.
There is no proof that Medusa could not help but to turn people to stone.
Medusa could turn people into stone.
When someone looks at Medusa they turn in to stone.
Medusa can turn people who meet her eyes into stone.
Medusa
Medusa didn't "want" to do that; it was her nature.
In Greek mythology, the gas that turns people into stone is called "Medusa's gaze" or simply "Medusa's stare." Medusa, a Gorgon with snakes for hair, had the power to turn anyone who looked directly at her into stone.
no she turn them to stone
turn people to stone
turn people to stone
Turning people to stone
turn people to stone