Sort of like why traffic backs up on the highway, even though an accident doesn't block any of the lanes - you can't help yourself but to stare in wonderment and amazement. In this case, at <you've received enough insults in this thread.>
To answer your question, the house had nothing to do with the Holocaust. Jews weren't killed there. He had a lot of affairs there until Hitler told him to knock it off; that's about its only "notoriety." Looks like a great lake for fishing, and looks very peaceful by that lake. If it was in my price range, and was in the area I wanted to live, (neither of which is remotely true) I'd jump at the chance to purchase it. Hell, for almost 50 years after Goebbel, it was being used as a school.
I can't wait for your next installment on this, 5 years from now: "the house and lake was purchased by a vacation company. Would you go fishing in that lake, knowing that 75 years ago, the lake was owned by a Nazi? You might catch something from eating the fish." Hell, using your logic, you'd want the White House torn down and a new building erected, because you don't like Obama.