So here's the thing - diversity of ideas is good, diversity of values is what people struggle with. As long as two people agree on where they're trying to go, they can disagree on the details of how to get there and still be perfectly happy - when either of them gets closer, both do.

But, say you're a gun nut and the people surrounding you are decidedly anti-gun-ownership - there's no shared goal, and no obvious resolution to your differences. If the people surrounding you make progress towards their goal, it goes against yours. There's nothing to do but fight. And fighting is exhausting.