It's quite obvious that, for some, war can never be justified. It is just as obvious that, for some, life on this Earth is not complete without it. The discrimination of the individual determines their place in that mix. Some, more than others, spend time trying to persuade that their position is "best" or "Right", that the other's is "worse" or "Wrong".
We all make "deals with the Devil", large and small, to get by in this life. In the end, often, it's only to serve our individual conscience that our personal "deals" are privately and interminably justified to soothe our troubled soul.
My attempt to persuade serves more to convince myself.