I personally hate war of any kind, but I feel like I'd be a fool to say that there is never a valid reason for one. If it is a matter of national security or if there is something horrific happening, such as a genocide, then sometimes war is validated if no other form of mediation works.
In our heart's no one wants war to happen, but they have since the beginning of time and probably always will. The reason is aggressive domination objectives of countries, religions, cultures, and individuals. It's sadly true, without wars to keep things in balance, one group or another would most certainly pick up all the marbles and control the entire world.
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