The Constitution does not delegate issues of abortion or murder to the federal government. If it is not a power delegated to the federal government by the Constitution, then it is not a federal issue but a states issue.
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of HappinessAre you really stating, with a straight face, that the good Christian Gentlemen (the Founders) who signed the constitution did not mean to protect all human life, even the unborn?
Very true but... the second sentence in the document that declared our Independence from King George clearly states three INALIENABLE RIGHTS BESTOWED BY GOD. What is the first right mentioned in the second sentence ever put to paper by what was to become the United States of America?
And if a state legalized murder, it would be taken to SCOTUS and shot down.