Our minds are capable of obsession so potent that it can result in self-effacement, and even self-destruction of both the body and the mind.
Why is that the case?
Why are we not a moderate, even keeled, and emotionally mild species?
It would take contact with intelligent life to know if consciousness necessitates the existence of powerful and often self-defeating emotions. But if we take a look at the world in which we exist, the apparent utility in obsession and its accompanying emotion comes into view.
Obsession, more than any other mental state, bestows upon its object meaning and value so that all possible avenues of attaining that object can be explored. When something must be obtained, our minds strain and calculate ingenious strategies that anything less than obsession would not have brought about.
But for every scenario where obsession breeds innovation, there are more that result in destruction and pain of both the obsessed and the object.
Equally pernicious is the plight of those who have succeeded in their aims, and find an emotional and motivational void upon reaching the other side of obsession.
There is nothing so dangerous as failing to assess the worth of your aims, and the realistic outcomes of both failure and success upon achieving them.