People have the ability to do things they were not instructed to do, or even instructed not to do, and that are against their best interest, not due to a mistake, not even only for a greater good, but simply because they can, an action that would require them to have libertarian free will. When we read the story of Pandora's box, or Eve, and the Apple, we don't blink an eye, we empathise with the characters, because it's not outlandish, it is the natural result of a creature with free will.
Following commands is not free will, one's nature is a form of command, therefore, if one is only capable of following their nature, they do not have free will.