The theological consensus that existed among the prophets of Israel in the time of Ahab was not unity. It was mutual deception. Some wanted to believe that there would be victory against Syria. Others (at least Micaiah) were convinced that there would be defeat. But they were all saying the same thing. We should be careful when the majority believes and teaches something, without paying any attention to the arguments against it. That kind of consensus can lead to disaster.
LORD, give us discernment.
1 Kings 22