This is a great example of “sibling rivalry”* in action. Just because some people question whether the unborn are living human beings doesn’t mean they have any facts on their side. Pro-lifers have all the embryology textbooks to support their view, not to mention concessions from leading pro-abortion people (see this link for a lot of examples of both).
Dream all you like about finding life elsewhere in the universe, but don’t be anti-science and ignore the logical and scientific fact of human life in the womb.
“Sibling rivalry” is a phrase used by Greg Koukl of Stand to Reason to describe the situation where people hold opposing ideas at the same time.
Sometimes objections come in pairs that are logically inconsistent and therefore oppose each other. I call this “sibling rivalry” because they are like children fighting.