alt Hacker NewsI think the most valuable thing here is to not jump to a negative assumption about people, something I wish it followed more closely in its other points. Virtually anyone who has a very different perspective than the group will face friction, and handling that friction gracefully isn't something that comes naturally to most people. People can get stuck in a pattern of handling the friction poorly, but the group as a whole also has the opportunity for grace and understanding that can diffuse the problem, if that is something that is valuable to them.
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Unless your primary concern is "winning".
Then step one is to cast the other fellow as the enemy, and then you create a case against him, leading the conversation in the appropriate direction.
It's a popular way to do it. See all of social media for examples.
I'm someone who is good at those situations, and what I've learned is that no matter how much you disagree, there's always something that you can agree on. If you're stuck in disagreement, zoom out, and try to move back to a position that you both can agree on.