If the Supreme Court ruled tomorrow that anyone who has ever used a screen name beginning with the letter U can be killed without any penalty for the killer, would you be thinking it was a matter for the states, or would you figure it was a ruling that should be overturned completely?
If tomorrow the SCOTUS declared that thunder is the sound of God bowling (about as silly an assertion as the idea that a fetus can be a non-human target) would it be a good idea to overturn it, or to let some of the states declare that it really is the sound of God bowling?
Since there is nothing in The Constitution that makes abortion a Federal matter, it must revert to the States.
These social matters are handled at the State level.