Catholic philosophy actually has quite a bit to say about this. Generally, the question is framed as, "When can it be OK to cooperate with evil?" The Archdioc

Catholic philosophy actually has quite a bit to say about this. Generally, the question is framed as, "When can it be OK to cooperate with evil?" The Archdiocese of Philadelphia has this little flow chart that does not go into much detail -- it's no substitute for the texts upon texts that seriously examine the question -- but gives you a taste of the moral calculations involved: http://archphila.org/HHS/pdf/CoopEvilChart.pdf http://archphila.org/HHS/pdf/CoopEvilChart.pdf