This paper aims to reflect on the relationship between wars and humanity. We will emphasise three essential points that make up this conflictual relationship: human nature, fear and disillusionment. Human nature in conflict can be related to waging war, because if we find differences, inequalities, in our societies, civilisations, war ends up being the result of this unequal essence of ours, because we end up tending towards conflict. In the second part, we'll look at the tension of fear as an ever-present factor in war. Finally, we reflect on how war brings us deep disillusionment, and this fact is well observed in our 20th century, with the most destructive wars we have witnessed.