Without the crucifixion there'd be no salvation and without the betrayal in the garden there'd be no crucifixion: so why is Judas seen as the villain of the piece? I thought this was a modern idea, but the newly discovered Gospel of Judas (a gnostic text from c. A.D. 300) has Jesus telling Judas to betray him.
The gnostics treated theology as an art form. They were happily irresponsible. They invented, speculated, played games.
Then the Church clamped down and it has taken us something like 1500 years to get those freedoms back.