What does it mean to be grandiose?

According to Merriam-Webster, a grandiose person is characterized by affectation of grandeur or splendor or by absurd exaggeration.

Never is a grandiose person in reality.  

Let's say a grandiose person believes that by dragging others down, then it will lift him into superpower status.  

Without real talent, no matter how many lives are destroyed, that person still will not achieve real superpower status.

The same goes for a country with grandiose delusions of superpower status.  

Without real infrastructure and economic assets, no matter how many countries are dragged down into chaos, it still will not give the assets, innovations, and economic might necessary to create a superpower status.

Will destroying the assets of others, create more assets? 

Destruction of others assets will create less assets as a whole.  

Less assets, less purchasing power, less customers, less economic stability for the world economy as a whole; less possibility of superpower status.

The same will happen as more focus on the grandiose and absurd, less focus on creating lights of healing and innovation, the less prosperity and longevity for humanity.