There is a curious divide in the pro-life movement between those who support the various Personhood initiatives, trying to get legal language that recognizes human embryos as human persons. The Catholic bishops have come out against these initiatives, though I haven’t heard a cogent explanation as to why.
Perhaps those more familiar would care to comment on the rationale and then square that with this quote from Pope John Paul II that appears in Dignitas Personae:
“…embryos which are and remain the subjects of essential rights and should therefore be protected by law as human persons.”
~Pope John Paul II