Abortion is morally wrong

[Esquilax]

The zygote is a human being according to science.

Both sperm and egg are not human beings, and neither are isolated human cells. Arthur is defending the rights of human beings.

The issue is that his category of "human beings" includes things that do not have the right to life too, like corpses, toenails and hair follicles. Merely making the assertion that the fetus is human according to this definition doesn't entail that it is one of the things that has a right to life, nor the special right to subjugate the bodily autonomy of another that he wants to give them.

There's additional arguments that need to be made here, and nobody making the initial claim seems interested in bridging that gap. They all just seem happy to stop at step one and pretend that's all there is.