and WHY was Prometheus a -- "thief"?

Why in the story of Prometheus stealing fire for mankind, stealing it from the gods, why was he labeled, a thief, why was the story structured so that the gift to humanity was something stolen? Perhaps you could say this was a reflection of what Jan Cox meant when he said when man developed an intellect, (got kicked out of the garden) he fell upstairs. Both stories involve crimes. Stil, what got me started on this was another aspect: because, Prometheus botched the job, had to of course---but he only got half the treasure, when you could say something else the gods had, was necessary for fire to be a gift, rather than fire being "hot" on multiple levels. In this reading Prometheus was a thief because he botched the job, he stole, not from the gods, but from Humanity.   And this would be, because, Prometheus only stole a tool that could be used EXTERNALLY, when as the gods knew well,  there was an internal world that need controlled ignition to be functioning at its highest level.
Crime, clumbsiness, makes me think of the big bang idea, that without some unimaginable small tremor in the explosion, the universe would be uniform, an identical soup in all directions, rather than diverse with planets and space, and different colors of matter.  Just a thought...