Why do pro choice women use the "abortion is normal" argument?

So what you are pretty much saying is that since abortion is very common that makes it ok? Ok well sexual assault is very common so does that make sexual assault ok? No. Of course it doesn't. So why use the argument that since this certain thing is happening regularly that means that it is ok? It's a dumb argument.
Why do pro choice women use the abortion is normal argument?
Why do pro choice women use the "abortion is normal" argument?
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