God, War, and Climate Change

I find one thing particularly interesting about the human species. We humans have well established ourselves—evidenced by thousands of wars, races between nations for more and more powerful technology, attempts at exterminating entire peoples, and countless power-grabs by despots—as the most selfish organisms on Earth; and yet, simultaneously, we have also made clear that we are the most intelligent species on the planet by far.

There are many examples from the past showing that humans do come together in incredible ways to achieve large goals. These times of mass unity and cooperation are often—if not every time in history—in times of dire existential threats.

My question is this: why is it that people visciously fight things they directly see, whilst concurrently ignoring much greater issues they indirectly see, while simultaneously believing something that doesn’t necessarily exist?

Put differently, why do (many) people fight or support wars against their neighbors, while ignoring climate change and believing so deeply in God?

In a soccer match, the fans often cheer louder as a result of the other team's fans cheering louder; it becomes this competition of who can cheer louder. It’s a competition.