Judas is one of the twelve apostles of Jesus. He was a trusted friend; he's the treasurer. He saw the miracles of Jesus. He heard his words, his commands, his parables. But Judas had to be practical. He had to choose where his future is secured; to choose who he thought was more powerful, more cunning, more clever, more influential.
Judas chose to be practical at the expense of loyalty, of fidelity, of commitment, of trust. Judas chose to be practical at the expense of the Son of God.