The sun will burnout and everything will destroy, in the end.
Brain wandered away from the path of reason because soul had already gone somewhere. Leaving behind pure logic, memories and worries. So it decided to do something different. Now when you are not designed to do what you’re trying to do, you create absolute chaos, unless something magical happens out of nowhere and the chaos gives birth to something as beautiful and unique as life itself. How sad it would be if that life it created was unfair.