Civilized men agree to disagree. No one has the monopoly of the fountain of knowledge hence, has the last word on this exchange of ideas i.e. "Period." When politicians run out of arguments, the common tactic is to divert the topic and talk about personal issues including grammar and spelling. This is the basis why civil discussion fails within the Lodge room. It is not the topic e.g. politics, religion, or best beer brand but the mentality that some people were already enlightened thus does not need to be challenge because what presented was the Truth.
Freedom of speech is still guaranteed by U.S. Constitution and that should include discussion inside the Lodge. Moral person knows what is right and what is wrong, finding the balance between the two extremes is a lesson all Masons labours to find --- of searching that which was lost. Equilibrium is not just a word, it is an axiom not only reserved for Scottish Rite Masons but also applies to the entire human race.
Political and Religious Discussion.