I believe they should all be burned with the smoke rising to heaven. The sacrificial altars are to be destroyed and turned to ash or dust.
I agree with your sentiment. Nobody ever set up businesses in postwar Auschwitz or Buchenwald. Why should these American mills of genocide be allowed to stand? They should either be razed to the ground, leaving no trace of their existences, or they should be turned into memorials for the millions of lives that were brutally (and literally) cut short within their walls. Even if man forgets, God will not.