If only GOD was a book acquisitions editor in London or New York ....

...HE probably say "we seem to have plenty of books on enacted war crimes but what about the even bigger war crimes that were crimes of intention , not of fully carried out action ?"

Because Christians - along with a lot of other religions and even some non-religious people - believe that it is mental intentions , even more than as actual actions, that makes something a crime and a mortal sin.