The omission of crucial facts and opinions happens in thousands of business meetings every day. If people don't feel safe, they aren't going to say anything. And you will have no idea about what you missed.
Too often the participants whose opinions count the most assume that the other members of the meeting feel as safe as they do. This assumption is wrong more often than not. But it is rarely ever tested.
I've published an article about how you can collect, share, and interpret data about safety during a meeting. Check it out at Safety Check.