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Lawyer here, the reality is the party of law and order is asking for all investigative and police resources to be spent on abortion instead of other things - like people raping children.  
The reality is, if there is a justification the cops stop their investigations before the justification.  That places the burden on the defense.  As a defense lawyer, I have had a lot of fun dragging out cases through motions and defense investigations. 
For cases like these, we need to empower sanctions against the state actors when they stop investigating before the justifications can be established. All too often, these defendants spend tens of thousands of dollars to achieve Justice.
You didn't abort the fetus, you need to just play clown world games like they do. By calling the action an abortion you assign intent to that.
it was trespassing on your private property after you told it three times to leave. After three warnings it was still on your private property and made no attempt to leave.
Then you stood your ground because you were in fear for your life, it was impossible to retreat because the perp was inside of you without consent.  Classic self defense case.
Somebody with a big brain and a law degree could probably figure out a clownish but legally justified argument along these lines.
That unemployed fetus didn't accept Jesus into his heart so lets be honest he was going to hell anyhow.