Judas did not say this because he cared about the poor, but because he was a thief. As keeper of the money bag, he used to take from what was put into it.
KJV
This he said, not that he cared for the poor; but because he was a thief, and had the bag, and bare what was put therein.
ASV
Now this he said, not because he cared for the poor; but because he was a thief, and having the bag took away what was put therein.