People, especially those who live in cities, are permanently on the defensive. They have to be. In that sense strangers are guilty until proven innocent. You can subvert this by establishing a connection in any manner of ways, by working together in the same office or just engaging with a smile and small talk about the weather.
I like the idea of an app that shows you what you have in common with the people around you at all times. Say you catalog all the books, movies, music, sports etc you like. The app, or augmented reality whatever gadget, would automatically list the strongest commonalities you have with that person. Like Dave said, 'The proliferation of echo-chamber like forums and clique-like behaviour can be frankly depressing.' But people in those cliques HAVE commonalities with the rest of us. They just aren't being highlighted.
TL;DR Everyone has something in common. End aggression and oppression by facilitating the discovery and reinforcement of those commonalities. Disassociate the differences.
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