“Catholics do not accept the scriptures as the sole source of special revelation.”
Understood. Yet Paul said he had taught the “full counsel of God”, and John wrote that “Everyone who goes on ahead and does not abide in the teaching of Christ, does not have God. Whoever abides in the teaching has both the Father and the Son.”
So how have you developed doctrine from sacred tradition hundreds or a thousand years after the Apostles? John said to ABIDE, and not to GO ON AHEAD.
Yet the Catholic Church has gone ahead and developed what the Apostles did not know. And John goes on to write, “If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting, 11for whoever greets him takes part in his wicked works.”
Simply stated, you have misunderstood the text, and made the translation of an admonishment into a legal dictum.
If your understanding of that passage were correct the Protestant Church would be no less guilty of violating its spirit than the Catholics.