Hello:
I think that a priest who is effectively pro-abortion is guilty of a sin punishable by excommunication by the Catholic Church. It shouldn't be too difficult to build up a case against him and bring him to the tribunal.
And you wouldn't need to act out of anger, pride or self-righteousness to do so. A priest with these ideas is a mortal threat to his parish community. By helping in having him disciplined, you'd actually be doing a great service to the Lord's Church.
But before doing that, please consider:
When Jesus defended the adulterous woman, was He condoning adultery?
Before taking action, let's think it twice to see if we really should cast the stone.
Shalom,
Memo.
