His general premise there is admirable and a good stance to take on the matter, but sometimes going to war is justifiable, as some others would leave you no choice but to take up arms and fight them. World War 2 was a good example of that, our country was attacked unmercifully, so going to war was the only logical choice of action.
Personally, I'd prefer to live my life in peace and be left alone, but I will fight back if necessary, no sense in being a pushover.