A devil's advocate is someone who really, honestly and sincerely argues that the Devil is right. Therefore, anyone who ever plays devil's advocate is a Satanist. This is obvious, uncontroversial and metaphysically antidistestablishmentarianistically longwordisimic.
Devil's advocates in discourse
It is impossible to pretend to be a devil's advocate without turning into one. So anyone who is "playing devil's advocate" is a Satanist witch and deserves to be burned at the stake BURN!!
This especially applies in discussions involving actual real people. People don't get set on fire nearly enough these days. More burning people yes!
The Screw Tape Letters
This proves that the devil writes letters and screws tape. Which is pretty perverted.