It's the same thing that drives people to want to experience sexual pleasure or have one too many drinks. We all want to experience the other, and to get out of our daily existence.
If I want to understand something, I must observe, I must not criticize, I must not condemn, I must not pursue it as pleasure or avoid it as non-pleasure. There must merely be the silent observation of a fact.
So I analyzed that and decided I didn't want to be the president during a depression greater than the Great Depression, or the beginning of a depression greater than the Great Depression.
You will never get to the irreducible definition of anything because you will never be able to explain why you want to explain, and so on. The system will gobble itself up.