The people that fell for this are idiots. Even if they didn't realize it was a setup ahead of time, there is no logical reason to yell 'N' out. That should have set off a red flag.
Plus last week's episode where they had lawmakers declare the merits of arming 4 year olds in schools. They were laughing and agreeing to everything. Absolutely no discernment or red flags until later (Joe Walsh said the red flag didn't go off in his head until the next morning).
This guy had to be drunk, high, or mentally disabled.