Here is what I would like to know. God created particles that half a half-life of a nano second. On the other hand the universe as we know it today MAY last for another 100 trillion years or forever. Juxtaposed is the average life of a human being, maybe 70 years. Why create humans at all? If so, why such a short life span in time that may last forever? Why exist at all?
The "short life span" was not Gods doing. That was sin. Adam would still be alive today except the fatal error of not following Gods instructions. Eternal life was a conditional proposition at Creation.
I have no questions why God created us. But if you think about it, we might not be at our intended peak of life expectancy. God created humans and humans created medicine. Compare today's longevity to that of 100 BC. Life expectancy was 35 yrs in some parts of the would. In the 1850's it was at 55 yrs of age.
Imagine what it could be in another 2000 yrs.
We were put here to glorify God, period.