War may be the most important issue facing the world today. That does not make it the most important issue for the 3rd party in Canada. The effectiveness of taking political stances has to be measured. For me the most important thing the NDP can do is work to make life better for the people it is most likely to effect change for.
For example right now I see no issue more important than Libby Davies' affordable housing bill (somebody help me with the number).