There is a very good book out on the Eugenics Movement called THE WAR AGAINST THE WEAK. It should be required reading in all High Schools and colleges. Also Chesterton's EUGENICS and OTHER EVILS.
Also Dehumanizing The Vulnerable - When Word Games Take Lives
http://www.lifecyclebooks.com/index.htm
hard hitting study shows how dehumanizing language was and is being used to justify violent acts against vulnerable people, including the unborn