As certain Buddhist lamas say, that is a question wrongly asked.
The problem isn't the group arguing, or the subject they are arguing about. It's the general state of discourse in the modern age and the lack of understanding when it comes to logical debating skills.
People tend to argue from the gut. They aren't so much seeking knowledge as they are defending a belief. From a defensive position, there is no reason to submit to your point, because it doesn't provide a positive outcome. From a defensive position, the only positive outcome is the continued holding-at-bay of your opposition. They have no reason to listen, and every reason to continue arguing, a situation which lends itself to circular reasoning and just about every other logical fallacy.
You, the opponent, are not off the hook either, because while they are on the defensive, you are on the offensive. If you are the one who started the debate, your goal is to make them submit to you. If they make a genuinely good point, regardless of whether or not it invalidates what you are saying, and it doesn't have to do so to be a good point, you have no reason to acknowledge it and every reason to dismiss them entirely and continue the siege. Which leads to ad hominem, and again, myriad logical fallacies.
The problem is that when arguing with beliefs, most people choose not to set aside their own personal flames, which is in my opinion the only place from which to argue correctly. In order to avoid logical fallacies, personal denial, and latent dishonesty, you must come exclusively from a place of seeking knowledge and learning, without the urge to win the argument. Treat it as if you are not trying to convince the other person, but are instead trying to puzzle out a word problem. "The law is reason free from passion."* and so must our debates be. Douse the fire in your gut, and your discourse with your peers will improve.
*Aristotle