The way it stands now, a fetus is a person legally IF IT WAS WANTED by the woman carrying it. And it is NOT a person if it was not wanted. This is proven by the case of Connor Peterson, RIP, and the fact that people still obtain 2nd trimester abortions any day of the week.
We need a definition of person that stands up. Under their definition, most of the homeless do not constitute persons. No one is saying we should put them to death because they aren't "wanted" by anyone.
Consider the legal and cultural framework in which slavery survived for years in the South. The basic premise of slavery -- reaffirmed in the Dred Scott decision -- was that slaves were basically no different than animals or property and therefore had no standing in Federal court and no legal protection under the U.S. Constitution. And yet many (if not most) of these states in the South had laws on the books that made it a crime to teach slaves to read and write -- laws which only had any meaning if slaves were, in fact, capable of learning to read and write -- i.e., persons and not animals or pieces of property.
Logical thought and rational legal principles are utterly meaningless to people or special interest groups who are hell-bent on legalizing and promoting morally reprehensible ideas.