Imperfect = arbitrary. The only thing that is for certain not arbitrary on this earth, is death. Everything on the earth that is alive, dies at some point. Death is perfect and not arbitrary.
For anything to be considered alive by the current standards of terran biology, it must have cell division, DNA replication, mitosis. All living things on the earth have this. All living things on this earth have DNA. This has been shown so far not to be an arbitrary quality.
In order to have death, something has to first be alive. This is the major sticking point in the abortion argument. The unborn child from the point of that first mitosis is indeed alive. Most people aren't intellectually honest enough to admit that they are killing with abortion.
My argument here is deductive and supported by facts. Arguments I have seen to the contrary are inductive, invalid argument forms of logic and only supported by emotion - - something imperfect and arbitrary.
Your imperfect and arbitrary argument comes from empathy, pathos, despair, phantasms in the brain of the maker (you), which does have a similitude to a religious belief or an ethereal foundation (per Hobbes, Socrates, Plato, Aristotle, Kierkegaard, Aquinas, Augustine, et al). I'm an atheist and I won't let you slide on that.
This is, in part, why I say abortion is a practice of ritual mass murder, a collective sacrifice to pagan idolatries.
Death is arbitrary too. There is no moment of death just as there is no moment of life. And once the body is dead beyond any doubt, the memory of the deceased lives on in the survivors.
Your statement might be more truthful, though than you may have meant.
Emotion is imperfect but certainly not arbitrary. If I cut myself, I feel pain. Nothing arbitrary about it. When I see someone else in pain, I recognize my humanity in their humanity and feel empathy. That's not arbitrary.
This statement, on first reading, sounds outlandish and paranoid.
Upon investigation, one cannot escape the inevitable conclusion that it is true, in both the figurative AND literal sense of the words. The cognitive dissonance resulting from denial of this fundamental truth is what makes the pro-abortion crowds' pro-death arguments so vicious and spiteful: they are trying to drown out their own consciences.
It isn't working.