Great video, the guy makes some good points.
When I debate abortion, if they say it's the woman's body, I say the fetus can't be her body because it has unique human dna.
If they argue about its dependence or lack of physical capacities, I say it's a temporary dependence or lack which the parents put upon it.
I compare it to a situation in which, say, person A drives wrecklessly and puts person B in a coma. Does person A have the authority to pull the plug on person B's life support simply because there's no brain function? Especially if B is expected to recover? The dependency of a baby is a naturally temporary situation that it was put in by sexually mature human beings.
If they argue on scientific grounds, I say science does not have the authority to define humanity. For them to use science to define existential values and philosophical ideas, turns science into something like religion in a theocracy. Science can say things about humans but it cannot define 'humanity' entirely, as it is not objective about humanity.
Rights in society are basically agreements between the members -- we all desire x, we all empathize with eachother as being human, therefore we agree to cooperate and not take x from eachother. Here, x is the desire to live. We all came to this desire by becoming alive, we value our lives so we go on living them. And we empathize with others as being human -- they became human the same way we did. But the way we became human was by having human dna given to us when two rightful human beings decided to pass on their rights and create a new human being.
There are exceptions but there's really no rational reasoning against it in general. Sex is designed to make new human beings the same way a gun is designed to kill something. Arguably, sex is more powerful, because life is stronger than death, but people don't want responsibility for such a great power. It's ironic they will talk about life evolving and adapting to survive, but ask them how many years the human genitalia evolved and what its purpose was, and they will backpedal.