Judas was Christ's disciple. As His student, he was present at all manner of miracles and healings, not to mention he had the benefit of hearing Christ teach, instruct and preach to the multitudes. What an education he had.
...and yet in the end he betrayed Christ.
One could argue that St. Peter also betrayed Christ. However, St. Peter retained the words his Master had taught him. He felt remorse and guilt. He hid and cried. Most importantly he begged forgiveness.
Judas on the other hand, threw away everything he had seen and heard. While Christ had instructed to love, be compassionate, to forgive and to repent - all of these seemed to have escaped Judas. Even realizing that he had made a mistake, he seemed to drown in his guilt, but, instead of following Christ's instructions to repent, he took his life, thereby only adding to to his own guilt. His pride once again interfered with his common sense, and he could not bring himself to ask for God's forgiveness. Even in the end he listened to Satan, taking his own life, and didn't heed God's words, nor look for God's love and forgiveness.
You say that he "facilitated" the death of Christ...yes. However, what if realizing the horrific thing he did, instead of committing suicide he repented....in so doing he may have been a great missionary and baptized hundreds. What a loss.