This is entirely backwards, and it has nothing to do with moral relativity vs moral realism.
Moral relativity
is "moral realism", ie, recognizing that
no one has The Truth. Religions say they have it, but
they can't agree on much of anything from year-to-year
or religion-to-religion. They lack a reliable source.
I start with considering the effects of various moral &
ethical concepts, & select those which function the best
best (IMO).
To start reasoning by assuming morals from some
particular source, eg, this or that religion, is worse
than backwards....it often causes evil, eg, forcing
a raped child to give birth.
Relativists are just as capable of having a consistent logic to apply to morality as a realist; for instance Mill's Utilitarianism still has a logic.
Logic isn't typically the problem.
It's the selection of dysfunctional premises,
& treating them as inerrant universal truth.
If you don't claim the differences aren't developmental, why have you been harping on me for identifying them as such?
Nay, you keep "harping" on "developmental".
I consider that tangential. What matters is
the functional relationship of the fetus/person.
Seeking clarity; If I'm brain dead, have an advanced directive set up and the funds to procure life support, it would still be okay to kill me?
Are you even legally alive when brain dead?
Setting that aside, you've no right to "life" of
a brainless body. But this lack is not to say
that you cannot prearrange support for a body,
so long as you pay for it....not the taxpayers.
You can feel free to replace "moral development" with any other arbitrary standard, the inherent question is "why"; why should we evaluate biological development as rights bearing?
Arbitrary? Your argument appears to start with strict
morals that don't prioritize the range of consequences.
Ova and sperm have their own life cycle, being produced, maturing, and dying. The zygote is the same thing as the adult that will later develop; so yes it has full human rights, because rights are inherent, recognized not given, and cannot be taken away, only ignored and abused.
This is just stating your claim, not really arguing
why it's a better approach to rights than mine.
1) What is your fundamental basis for giving right
to live to every fertilized human egg?
2) Do you see any exceptions due to deleterious
consequences to the mother, eg, health danger,
rape, incest, severe congenital disease?