At the end of WWII, the remains of Adolf Hitler and Eva braun were found by the soviet forces with dental records confirming this. Yet, according to wikipedia Stalin and Russia maintained for many years afterwards, for politically motivated reasons, that Adolf Hitler had fled to Argentina or where still alive somewhere else.

What would these politically motivated reasons be? What reasons did Stalin have for making people think that Hitler was still alive instead of telling people that he's for sure dead and showing the proof?