The next time you find yourself in Berlin make a visit to Tiergartenstrasse Street number 4 and visit the post-war memorial that marks the site.
Go there and you will see where Hitler had his Euthanasia Center (codename "Aktion T4"). The world knew this as the "Reich Committee for the Scientific Registration of Serious Hereditary and Congenitally Based Diseases."
From here doctors organized the murder of psychiatric patients as well as persons living in nursing homes, etc. The personnel were later moved to Poland in 1943 to be responsible for more "mercy" killing of Jews and others.
They now say that under this Nazi Euthanasia program over 200,000 were killed. Today, we are again creeping toward this as laws are being advanced to make this process legal; murder under the title of "mercy."
Is history not prologue?