During the WW II a lot of works of art changed their location and ownership. From Nazi point of view, thy were legally, confiscated especially to the Jews and those, who were considered the enemies of the Third Reich.
Their transfers from the place of their origin to Nazi hands became part of the purification of German culture. This phenomenon of politically newly born cultural process created a very effective political tool for the mass influence.
Eve if the prominent Nazis gave impression of an unanimous political force in their public speech, but in reality, they were very divided in their opinion on methods, means and forms. To fulfill their concept of pure German culture, they abused their power for looting, plundering and ruining the European culture.