The states have their own laws on every other crime against life. This seems to work OK without Federal interference. And it worked OK with respect to abortion for one hundred and eighty six years.
The states also had their own laws on slavery. Was that OK?
I guess what it comes down to is whether you believe there should be a 14th Amendment at all, or whether the states should just be trusted to make up their own laws about what constitutes a crime and who gets protection and due process.
And whether the 14th Amendment should grant Constitutional protection to all biological persons, or only to some - with the states choosing which human lives get protected and which not.