Because under the Constitution a person's fundamental right to live has nothing to do with the state he resides in. If a state tries to deprive you of your life without due process, it's a federal matter.
My contention is that it isn’t something that needs interpretation. It was not enumerated as a federal purview at the time and shouldn’t be now because IF that question had been put to them then they’d have found it (abortion) unconscionable and banned it outright.
To try and apply constantly changing views and interpretations of today against the Constitution’s specific language and ACCEPTED adoption is pointless. It just throws more folderol argument to those who want to claim murder of unborn humans is “reproductive health.”