John F. Kennedy believed that while a nation must be strong enough to defend its freedom and deter aggression, war should always be a last resort. Living during the Cold War, he understood the devastating consequences of modern warfare, especially nuclear conflict. Kennedy emphasized the importance of diplomacy, cooperation between nations, and responsible leadership to maintain peace. He believed that true strength was not measured by a willingness to fight, but by the wisdom to prevent war and create a safer future for coming generations.