Have you read Milgram's book, Obedience to Authority? He does some analyses of the participants in various versions of his experiment (as well as explaining why the experiment isn't unethical).
Thanks for the link -- I'll put it on my reading list. For some reason I only know Milgram's work from secondary sources.
Also relevant here are the Asch conformity experiments ; they also show the tendency of most people to conform, without the dramatic effects used in the Milgram experiments.
A while back I did a couple of posts on the care and feeding of young rationalists. Though it is not new, I recently found a truly excellent post on this topic, in Dale Mcgowan's blog, The Meming of Life. The post details a survey carried out on ordinary citizens of Hitler's Germany, searching for correlations between style of upbringing, and adult moral decisions.