The moral responsibility for their faith would still be on the human traffickers. No country is responsible for saving people in international waters.
This is broadly speaking true. Nevertheless...
Nevertheless Pope Francis summed up in one word what has to be said about the attitude of EU countries toward people drowning in international waters:
vergogna (shame).
The quote below is for politicus and likeminded people on this issue.
http://w2.vatican.va/content/francesco/en/homilies/2013/documents/papa-francesco_20130708_omelia-lampedusa.html