I was wondering if there's a factor of inevitability involved, but apparently not. It's a matter of saying, "As far as we have observed, this is the case."
Well, its inevitable that
most populations are not increasing. If they were, there's be way too many animals on the planet. It seems so obvious to me I don't know how you can't see it. The claim isn't about
all populations, just most of them. We can't have most of the populations increasing.
What about this fact?
5. Fact: Some traits make an organism more likely to survive and reproduce, while others make an organism less likely to survive and reproduce.
Is this inevitable?
Yes. Again the claim is only for
some, not all, of the traits.
Perhaps all mutations could be neutral?
Nope, we know of mutations that are not neutral, they cannot
all be neutral.
Are mutations themselves inevitable?
Yes, because of inaccurate replication.