I hear what you're saying but this is not a miniscule problem for me. I've had friends have a falling out over politics and I have gotten into at least semi heated conversations in person or online with friends or coworkers. My parents argue over immigration issues and if I post about climate change on facebook, certain "friends" start arguments. This is where Braver Angels steps in. Perhaps I run into this more because I volunteer with organizations like Moms Demand Action (gun violence) and Citizens Climate Lobby, as well as canvass for my local county Democrats, so polarizing topics can come up. When I think of the one friend who was one half of the aforementioned fallout, I learned she does not vote all the time or pay good attention (proof: she didn't know who our two Senator candidates were two weeks before the last Nov election). Perhaps she's an anomaly, though.