I think that's cold for you to wilfuly misinterpret my point so. Fine, we'll apply it to the gold standard. In news.y for the 1800s someone recommending moving away from the gold standard would get downvoted to hell by those that "disagree". Their comment would grey and vanish to most.
By encouraging downvoting disagreements you encourage large consensus to shut out contradictory voices by downvoting them, regardless of the voracity of their arguments. This means that all voices are significantly constrained by the habits of the present as opposed to attempts at deriving truths that are correct regardless of the age.
IMO downvoting for disagreement is entitled behaviour because its greedily taking an extra vote. You get an upvote for agreement, to upvote AND downvote is two votes. Why should some people get two votes?