The same place the Protestant churches get theirs - the human race.

In one midwestern city a priest of the Episcopal Church was convicted of selling drugs out of the rectory.

In another a Lutheran pastor was defrocked after moving in with a parishioner's wife.

And so on.

If Jesus had Judas Iscariot it should be no surprise the occasional turnip appears in the basket.

It is not a "RCC" problem particularly.