I’ve always enjoyed former lawyer and current baseball analyst Craig Calcaterra’s Twitter-length take on how tribalism is responsible for most of our opinions:
Recently, David Brooks had his own Op-Ed-length take on tribalism and political beliefs through the lens of the gun debate in the US:
Looking back to the darkest days of the 20th century, you'll see we can't just turn tribalism off. George Orwell called it by a different name — Nationalism — but in the hyper-tribal World War II era, it looked largely like it does today (although with very different consequences).
Perhaps we may not be able to completely move away from tribalism — Orwell's nationalism — is because it's coded in our DNA. If you want to place blame for tribal identity, look to evolution, argues Jonathan Haidt of the Righteous Mind: Why Good People Are Divided By Politics and Religion: