I like your grey area analogy. Why do we constantly feel the need to validate our own personal point of view as the only correct solution while completely ignor

I like your grey area analogy. Why do we constantly feel the need to validate our own personal point of view as the only correct solution while completely ignoring or even considering the potential from an opposite angle? Even in the worst scenario in which the opposite side could be in the wrong, but surely there must be at least a few good things come out of it. We ought to focus on those details. Our world is indeed full of grey areas, but human nature just tends to default to a black and white, us vs. them mentality. It probably helps to strengthen our individual identity, yet it hinders and limits our full potential at the same time. Even the strongest ideology will never stand the test of time as it is only created by humans, for it must constantly evolve or be replaced by another one due to human limited life expectancy. It can never be true forever in a dynamically changing world. The key to intelligence is being able to hold two opposing ideas together in our minds while still function perfectly well at the same time. This, by the way, is a teaching that comes from the West.