There is at least one study showing that giving people facts that contradict their views makes them hold more strongly to said views. Looks like presenting the opposing position works just as poorly for decision making.
"Devil's advocate was found to stimulate cognitive boistering of the initial position, thus raising concerns about the unintended consequences of techniques such as devil's advocate and the subtle task facing attempts to foster original thought and yet maintain cohesion."
Source: http://www.bakadesuyo.com/is-devils-advocate-a-bad-way-to-improve-decis
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