system
Given the following post, respond as if you're commenting on Reddit:
human
Why are pro lifers generally not vegetarians?

I saw a post on here about pro life arguments. It prompted me to think about the supposed parallels between pro life arguments and pro animal rights arguments. Both seem to entail that personhood and capacity for rational agency are not necessary conditions of being a moral subject. 

Personally I'm pro choice & pro animal rights. I just fail to see how pro lifers can be meat eaters and pro hunting, while simultaneously arguing that killing a fetus is murder.
Fetuses aren't even sentient until 24 weeks and literally annot survive by themselves; they are entirely biologically dependent on the mother.

On the other hand, animals are biologically independent and are fully sentient. 
Surely if you believe that killing the former is murder, it necessarily follows that you think killing the latter is murder too? 
Especially as there is really no distinction between humans and non human animals that isn't entirely arbitrary nor exclusive of marginal humans.

Is there something I'm missing?
gpt
I think you’re trying too hard to make their argument seem alien. It’s pretty obvious to me. They care about humans and not animals. It’s the same reason most otherwise kind, loving people give for not being vegan.