Interpretation of Viva la Vida (Coldplay)

I have never thought that the text of this song could be so complex. There are lots of interpretations on “Viva la Vida” and this is mine.
I think that “Coldplay” wanted to highlight the fact that if someone has the opportunity to exert his/her power and authority on someone else, like a king do with his subjects, he/she has to do it brightly and in the right way. Moral values are important elements someone should take into account every time he/she has to do something, otherwise contempt and hate are the damages he/she will pay. On the other hand, if someone uses his power to help other people, without becoming arrogant or assertive, he/she will be remembered with love also after his death.