You can't argue with original and tangible evidence....unless off course Judas himself was lying (lol).
I wondered what they catholics had to say about this, so i checked and this is what i found:
"If he had been asked to betray Jesus and did so, why would he feel remorse for doing so and hang himself, as he had done what he was supposed to have been asked to do?"
For full text, see
http://faithofthefathershottopics.bl...-of-judas.html
I think the catholic church has a secret vault of counter attack mechanisms. They've managed to beat down (though not always satisfactorily) most conspiracy theories about the church.