If you're in the minority Harmony is sweet. It's almost indispensable to teamwork. But harmony is a matter of atmosphere-friendliness rather than hostility. It doesn't mean that members always agree. New ideas stick in the craw.
Old ideas seem sacred.
Emotions and personalities trample logic. Therefore, it's a duty of a good committee member to question everything silently and to speak when answers continue to elude him. Most of us shrink a little from asking such questions. We know our colleagues prefer to feel that everyone agrees with them. As Ordway Tead points out, even in the midst of disagreeing, most of us abhor disagreement.