But things changed completely when the 'Black Notebooks' were published a few years ago [1]. They showed antisemitism to be a much deeper part of his thought, and it's much harder to argue that he just paid lip service to Nazism. He explicitly asked for them to be published last of all his writings [2], perhaps because he knew how controversial they were.

[1] https://www.theguardian.com/books/2014/mar/13/martin-heidegg...

[2] http://www.openculture.com/2015/03/martin-heideggers-black-n...