Why should we consider a fetus a human being who deserves rights?
Answer that question well and you will convince libertarians that abortion is wrong and should be banned.
Calling them immoral isn’t going to do anything.
Why should we consider libertarians humans deserving rights?
Both questions are equally morally obtuse.
Libertarians who are willing to draw lines between humans deserving basic rights and those undeserving of them expose a grossly utilitarian selfishness in their moral calculus: life and liberty for me, but not for thee.