Technology advancements and increased skill in warfare pose a continual threat to our life today. War grew more harmful as civilization developed and became better structured. With a single click of a button, we now possess the capacity to annihilate the whole globe. In spite of this, we see that we are progressively unleashing a technological global catastrophe that has the potential to wipe out mankind as we are driven by certain factors to wage war with increasingly advanced and contemporary weaponry. As a result, we are now the most potentially harmful species on Earth. In order to ascertain the moral justification for war, this essay attempts to consider its reasons. This allows the paper to focus its discussion on two important facets of the study of war. It looks at two things: first, the current reasons for war; and second, the moral justification for war among humans.