I do not see where life has any advantage over death.
If you don't see how living is preferable to dying, you've got problems.
It looks like natural selection gives them equal opportunity.
It doesn't -- and neither does the environment.
The following is a very crude analogy, but bear with me.
Consider -- Some people are blondes, some are brunettes.
When it became apparant that the "Son of Sam," David Berkowitz was targeting dark haired women, women dyed their hair, bought blonde wigs, etc., anything they could think of to stay off his radar, as it were.
I'm sure if you walked around New York City in 1976-77, you'd have seen a lot more blondes than the statistical average -- and that was the result of just one man.
Now imagine a hundred Sons of Sam.
Now imagine a thousand.
Now imagine a million -- with no way to get rid of them.
Turn a million "Sons of Sam" loose in New York City for a few years -- how many non-blonde women are you going to see?
Consider that blonde people are that much more likely to have blonde children, you can see how the environment affects a species.
I remember going to a fish hatchery once. In a man made controled situation they can get most the eggs to hatch and produce fish (97%). In the real world maybe 3% of the eggs survive.
Which is why most fish lay dozens, if not hundreds of eggs at a time -- even 3% of 100 is 3 fish -- so the species continues.
It's possible that at one time there was a species of fish that only laid a few eggs at a time, but went extinct. Can you see why?
Some people feel over population is the problem, when there is nothing to keep things balanced and under control.
Thomas Malthus philosophized along those lines, IIRC.