I don't see anywhere that Brigham ever said Joseph was wrong about anything.<quoted text>OK, let me get this straight. Brigham claimed Joseph Smith was wrong about black persons in the priesthood? And all Mormons followed what Brigham said over what Joseph said for a hundred years? If so, then why would you ever trust a single thing a prophet ever says?
Prophets are human. They have opinions just like you do. They make mistakes too. This is why they encourage us to use the Spirit as our guide and pray for ourselves to know if something spoken is true.