“In any case, Brigham made it clear that he was expressing his opinion: “Do you think it is inhabited? I rather think it is.” Prophets are entitled to their opinions; in fact, the point of Brigham’s discourse is that the only fanatic is one who insists upon clinging to a false idea.”
NOOOOOOOOOOOOOOOOOO
The REAL prophets of God were NOT “entitled to their opinions” God commanded that His prophets only say and do what He told them to...
The prophets were extremely carefully to only speak the oracles of god and not uttert careless stupid “oppinions”...They got into trouble with god when they did their own thing or spouted off their own “opinions” or disobeyed God...
Because mormons say that Joe Smith and Bing young were prophets like Moses, we’ll begin with him...
Because of disobedience, God allowed Moses to see the Promised Land but he was never allowed to enter it...
Because of Uriah and bathsheba etc, the son of David died and he had trouble in his family and kingdom all his life ...
Samson had his eyes plucked out, and was treated like a beast of burden...
Jonah disobeyed God and refused to go and prophesy to Nineveh...He travelled in the opposite direction and was swallowed by the whale...
On your main point, I disagree that a prophet can’t have personal opinions on things God has not revealed to him about. And examples can be found in the list you and I have generated. Peter was wrong about not eating with gentiles and had to be corrected. Elijah was too pessimistic about the faith of Israel and had to be corrected. James and John were wrong, and had to be corrected. And so on.