The good doctor is too hung up on the term "human being" - it's lawful to kill a fully grown human being under certain circumstances - a fact which anyone who carries a defensive firearm is well aware.
The question of whether a fetus is a "human being" is only tangentially related to the legal issues regarding how and when it is killed.
The good doctor is not hung up on the term "human being" Like me the doctor is hung up on how good men can not read simple English. The Declaration of Independence is vary simple and vary clear in the establishment of our inalienable rights. The Declaration forms the government and set forth it's limitations. The foremost being it can not violate the inalienable rights. It also provides a remedy if the government does, and that is the right for the populace to abolish the government and start anew.
The problem here is we have let those in power get away with silly acts like righting a 400 word document just to say no and to search for the meaning of the word "is". The enactment of so many and so complex and convoluted laws that the citizens of this country have no clear meaning of right and wrong.
The original intent was for us to have vary few yet strict laws and those laws were to be interpreted vary liberally.
I've never known a baby to attack its mother or an abortionist.
Considering that killing a child is not only a legal issue, but also a moral issue, your argument has no standing. My children had detectable heartbeats at 8 weeks. Does that mean they are not human beings? What's your definition?