In 2022, nearly half of Americans anticipated civil war, with current global statistics indicating one in five people believe political violence is justified, largely attributed to social media-fueled polarization and extremism. However, new research challenges the pervasive "filter bubble" myth, revealing that online environments actually expose individuals to more diverse opinions than their real-life interactions with friends and family, where ideological isolation is more common. The core issue lies in our "dumb brains," which evolved for small, cooperative tribal structures and struggle to process the vast array of differing views encountered on the "digital village square." This leads to "social sorting," where the brain categorizes individuals based on worldviews, transforming disagreements into central identity conflicts and lacking the social "glue" that traditionally fostered coexistence. Social media algorithms intensify this by prioritizing engagement through anger, amplifying extreme and controversial opinions, which reinforces "us vs. them" narratives and demonizes opposing groups, a phenomenon particularly strong in the U.S. two-party system. This erosion of social cohesion undermines the foundation of democracies. To mitigate this, the text advises self-awareness regarding social media's impact on our brains. It proposes a return to smaller, fragmented online communities, akin to early internet forums and blogs, which, like distinct "digital villages," could better manage our brains' limitations by offering necessary "distancing" from overwhelming conflict and re-establishing communal norms. This approach acknowledges that while all humans are part of one team, our brains benefit from a degree of separation to prevent destructive social sorting.