Out of curiosity, since I read this question What are Operations Research applications for 'good causes'? and thought it might be a good addition to it.
What are Operations Research applications, where ethical/moral stakes are involved? I mean applications that lead to ethical questions that go beyond the initial purpose of the application and people would eventually refuse to work on this because of ethical reasons. At first I wanted to use the term "bad causes", but this is too subjective and I tried to phrase the question as neutral as possible.