On May 21, 1940, in a dark chapter of World War II, the Nazis carried out mass killings of “unfit” people in East Prussia as part of their secretive T4 Euthanasia Program. This program aimed to exterminate individuals deemed unworthy of life due to severe psychiatric, neurological, or physical disabilities, based on the twisted principles of racial hygiene and eugenics. The atrocities committed under this program reflect the horrific human rights abuses of the Nazi regime and underscore the importance of remembering and learning from the past to prevent such inhumanity in the future.