This is my take on it...
One...Iowa voters are not novices. I’m sure they have seen plenty of dirty tricks.
Two...The reports were that Cruz and Rubio staffers were there spreading the rumor that Carson was suspending his campaign.
Was there no Carson staffers there to refute the rumors? If not? Why not?
Three...if Carson supporters were there to caucus and no Carson staffers or spokespeople were there...it would take about 30 seconds on a phone to find out if the rumor was true.
And then acknowledging your point that the number of people who have come forward saying they were tricked is zero...i think this is just an attempt to take disparage the winner!
Good take. No disagreements.