Why shouldn't countries go to war other then for self-defense?

Countries should avoid going to war for reasons beyond self-defense because conflicts often lead to significant loss of life, destruction, and long-term social and economic instability. War can exacerbate existing tensions, create humanitarian crises, and result in global repercussions, including refugee flows and economic sanctions. Additionally, diplomatic solutions and negotiations are typically more effective in resolving disputes and fostering lasting peace. Ultimately, prioritizing dialogue over military action promotes stability and cooperation among nations.