well, in truth, someone had to betray Jesus.
the Gospel accounts tell us that what motivated Judas to do what he did, was evil. the fruits of that evil inclination were greed, and betrayal.
satan was at work. yet his evil was part of a greater plan. something something evil and painful had to happen in order for a greater good to come about in God's plan. He is sovereign, and uses evil as well sometimes, to bring to light a greater good. this is the central message of the cross- evil and pain bringing forth glory, goodness, and salvation.
the Bible tells us over and over that often, in order to get to the good stuff, difficulties must often be worked through first. i'm sure plenty of non-Christians could agree with that, too. the theme is that God has a plan, even in the midst of suffering and hard times. think of Joseph's mistreatment by his brothers, and the tumultuous way Jesus of Nazareth came into the world.
Jesus was betrayed and sold, handed over to be beaten and killed, and subjected to a truly lowly and painful execution. yet marvelously, according to Christian faith, through this dizzyingly sad and apparently meaningless series of events, God's glory shone through in a way not even hoped for from Golgotha, and death was conquered on a quiet Sunday morning.
for a Christian, the central character is Jesus, not Judas. i remember a wonderful animated film called "The Miracle Maker" which gave an intersting perspective on Judas' character and motivations. it portrayed Him as a patriot, waiting excitedly for Jesus to leap onto horseback, and lead a Messianic army against the hated Roman empire. this didn't happen, and when Jesus was clear that He'd be handed over to the Roamns to be killed, Judas' hopes were crushed. furious, embarassed, and indignant, Judas sells his friend out, and gets Him arrested, realizing later that He'd betrayed an innocent man. this is, mind you, the perspective of the film and not neccesarily the Bible. but i found it interesting, and plausible.
what is most meaningful for me as a Christian is not hypothesis derived from details of the Gospel narrative, but the overall message. God has sent His Son, the Messiah, to save all peoples. He has died, but is risen, and is alive today. to know Him and walk with Him, to believe on Him, is to have the treasure of God's kingdom. i do believe this, and live out that faith as best i can., with God's help.
scholars and curious critics of faith will always have a new spin, something new to guess at or emphasize. previously it was the person and role of Mary of Magdala, and scores of stories supposing all kinds of things. before that it was a ton of new books trying to discredit or dismantle the Biblical portrait of Jesus, and reduce Him to an over-blown, mythicized human rabbi, a kind of Jewish Gotama Buddha.
there are many things to emphasize or speculate over, yet to remain fixed on them is to miss the Man. He's a lot of things to a lot of people. and no two people who have met Him and known Him will see Him the same. yet the Man remains the same yesterday, today, and tomorrow. He's always there; patient, available, offering us His word and His promise.