[PeteCat]

For an historical perspective.

http://en.wikipedia.org/wiki/Action_T4

this is how it starts.

[wagglebee]

Here are some more links:

http://www.ushmm.org/wlc/en/article.php?ModuleId=10005200
http://www.historyplace.com/worldwar2/holocaust/h-euthanasia.htm
http://www.life.org.nz/euthanasia/abouteuthanasia/history-euthanasia6/
http://www.ushmm.org/museum/exhibit/focus/disabilities/
http://www.shoaheducation.com/t4.html

This article, “Useless Eaters” by Dr. Mark Mostert is the best that I have ever read on the subject:
http://www.regent.edu/acad/schedu/uselesseaters/text/2743414051_1.pdf