I always think it's best to not antagonize and to speak to them with compassion and understanding.
In all fairness, the majority have blinders on that are, for all intents and purposes, are glued on with cement and we have to chip away at them until they fall off or are removed by the individual themselves.
It reminds me of when Mary went to look for Jesus at his tomb after he had been killed. Jesus appeared to her but Mary was unable to recognize him until he called out to her then her eyes were opened and she recognized him.
That's how it is with members. They are unable to see something that has been obvious and right in front of them all this time. How many times have you heard "I can't believe I fell for that or used to believed that!"