Sorry Adam. I started this thread and haven’t had much time to participate.
I don’t believe the Pharisees were infallible for several reasons which I will quickly outline:
a.) Misuse of corban rule (taught as doctrine the precepts of man)
b.) Failed to recognize Jesus as the messiah and more than just not recognizing Him a the messiah they fully rejected Jesus.
c.) Fouled up the doctrine of justification which Paul spent a fair amount of time correcting in the NT. While you and I won’t agree on the details of justification either, it’s apparent that neither one of us will agree that what the Pharisees taught was the correct view.
d.) While I don’t have an issue with this example I would imagine Catholics would. The Pharisees did not accept the deutero’s as inspired.
e.) Jesus’ admonition to the people to do what whatever they (they being whoever sat on Moses seat) obviously had some limitations since they were testifying against Jesus being the Messiah.
f.) We find way back in the OT that Moses took his “seat” as a judge with no hint of infallibility attached to the role.
g.) I haven’t heard any well known Catholic apologists make the claim that the seat of Moses had attached to it the charism of infallibility. Maybe I missed something but I’ve yet to see or hear the claim being made in a formal debate.
h.) I am unaware of any Jewish claim that the seat of Moses possesed the charism of infallibility and one would think the Jews would probably know about it. Again, maybe this is a belief among the Jews but I have seen no evidence of it.
That is a thumbnail sketch of why I don’t think the seat of Moses had any charism of infallibility attached to it.