Relational

Contempt is a destroyer of relationships. Jesus warned against calling anyone a fool, saying it would put them in danger of the fires of hell. But the Bible also teaches that it's important to recognize a fool, and Jesus said not to cast pearls before swine. Is it possible to name a leader and his followers as fools, but do it with no contempt or hatred? If it's not possible, does the Bible command me to ignore what's plain, or even to lie?