We are like fish out of water. Just as a fish cannot be happy unless he is in the water, we cannot be happy apart from the spiritual world.
Everyone is hankering for happiness because by nature we are happy : anandamayo ‘bhyasat (Vedanta-sutra 1.1.12). As spirit souls we are naturally happy, blissful.
Joy can only be experienced when we offer our love to Krishna.
When we understand our relationship with God then we all will be happy. It is an essential factor for establishing peace in the world.