Why are they here

It’s human nature to hope to live to a ripe old age, and then lament that we’re old if we’re fortunate enough to live that long. It seems all our lives we fret about our mortality, yet in the last days see death as a liberation from both our aged bodies and this mad, mad, mad world.
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We humans are full of so many contrasts, yes? We yearn for peace and love, and in too many cases live the opposite. Imagine how we must look to an observer from, say, another planet.