When I’m in a meeting or at a conference, I always watch who the most senior person in the room looks to for approval after answering a question.
I feel this may only be leading you to their "handler". These people are often there to help keep the "important" or visible person of a company/brand on message. So when you witness a politician or CEO answer a question off the cuff they may just be trying to gauge how well they did.
Often the smartest person speaks least of all.
This is a sad truth most of the time. Depending on the setting they may not be speaking up, to protect their job or job prospects. In other circles it may be that they just don't have the energy to discuss the issues anymore; or feel their time will just be wasted.
Best thing to do in the end, is just make sure you are sorting out fact from fiction in the room.