“If the truth is a scandal, let the scandal be produced and the truth be told” (St Ambrose).
The supreme good of truth can never be sacrificed for the sake of a false unity. In fact, it would only be an apparent unity that could not last. It would be like pretending to live in communion and peace with our Father and at the same time despising His commandments and not striving to keep them. This can be applied to many areas and we would always come to the same conclusion: truth is such a high good that we must submit to it. God Himself is the truth and can never act without it.