About the content : Prior to french plot against Spain there were both Godoy threat during war in Prussia, and spanish state unstability which could be interpreted from the coup of Ferdinand against his father and Godoy. So Napoleon, with Talleyrand's advice, thought he had an opportunity to get rid of a Bourbon monarch and take a firm control on spanish kingdom and empire. Which was both a crime against international law and a political / military / economical blunder.
About the style: You compare french empire to nazi regime, parasite, 30-years war.
30-years war killed between half and two-third of Germans, a figure I did not find in any publication about napoleonic occupation.
I understand the easyness to use analogy to explain your point of view, but it is quite misleading. For example would compare english naval power to a fungus which destroyed the tree of dutch free-trade? It is both effective and unproper.