I think that one of the most basic reasons why war brings up so many controversies is because of the emphasis on the individual in the modern setting. The exploration of the individual's point of view from many different contexts makes the detailing of war a complex one. The modern setting is rooted in understanding "the other." In the retelling of war, this becomes paramount to its viewing. This means that the point of view of the victor is balanced out with the vanquished. The role of the soldier is contrasted to that of the civilian. The role of the anti- war agitator is counter-posed against that of the war hawk. The result of all of this is that war becomes very complex and subject to much in way of controversy. Heated discussion adds to the topic when the loss of life becomes an inevitable part of the dialogue. When absorbing the narratives of lives lost and lives forever changed, controversies result as new emotional and neurological pathways are opened and transformed. It is in this light where war brings up much in way of controversy and challenge. It becomes one of the fundamental arenas where exceptionalism and conflict collide, with confusion and a lack of certainty as the only certain results.
war may not neccesarily be physical but we also have other types ....this may fall in certain categories such as peacefull demostrations which has been used by many people including Mahatma Gandhi of India who managed to use this means to win his people freedom from the British....however physical war is a rather violent way of getting what we want ..use of guns ..knives and other weapons are commonly used in this part..But t answer your question i think war is not really a controversial topic .one is either right or wrong..and if you are fighting for a good cause e.g fighting oppression of your people,family or even your country the the war you are fighting in is worth fighting for.the other side of the coin is fighting for the wrong reasons which may include using an authoritative means to dictate over people..this has shown as what can happen especially in countries like Libya where such power has not worked effectively and just to add on to that i think that Nuclear energy will can not be termed as either negative or positive if we have not seen being used in the modern society.