Sabotage from Within

People within the system (group, organization, party) who say that they are being a Devil's Advocate often use this phrase as a rhetorical ploy to sabotage the primary argument. The phrase allows them to hide behind a mask where they do not have to accept accountability.
If they object to the argument that is presented, they should courageously say so. If they are not sure about the argument, they should say that they are not sure instead of throwing out shotgun objections that waste time.