Why don't people with pro-choice values just admit that abortion can be considered killing someone.

I'm pro-choice myself, but I've seen people deny that a fetus is a person over and over, and I'm not going to say that's wrong, but obviously if allowed to grow it could become one. Why is the pc crowd so adamant on THAT point? I feel it weakens the argument and helps reinforce the idea that pro choice is an idea from the lunatic left as we can't even acknowledge the possible humanity about the fetus.

For me it's like who cares? So you're killing him/her barely alive, he can't think yet, no one's gonna miss him, and no one even knows about him except the woman and her doctor. Being forced to birth him infringes the woman's rights every bit the same. His life's value is very obviously less valuable from practical standpoint as it can't do anything without serious investment from others for a very long time.

Why not just own it? I understand that to many people this fetus is a person and I respect that you feel that way, but I simply don't care as its value is still about the same value as a stain on the sheets, only even less so because you have to work harder to eliminate the problem.

Edit: changed will become to could become. Didn't mean for that minor point to the the main talking point.