Just playing Devil's Advocate here - I'm sure the argument that will be used to rebut this involves the "innocence" of a fetus compared to that of a person who has murdered somebody (innocence is in quotations obviously because pro-life people will see the fetus as a being and pro-choice people will see the fetus as a non-being and so not capable of being innocent or guilty).
I will say that if this argument is used then one could also argue that there is difference between a person on life-support in a coma (like a pro-life poster said earlier) and a fetus in that although both have no capacity to think or feel* the person in the coma has gained something throughout living their life (similar to how one becomes guilty of a crime but think opposite - how one forms relationships with family and friends, impact on the world etc.) and have more value than a fetus. Of course, there's no winning this argument as both sides will be talking to brick walls, so this doesn't really make much sense me posting this, but whatever.
* Somebody said that a brain-dead person in a coma still retains some cognitive function or something similar to that, look back over page 1.
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Again back to the main topic, even though I'm pro-choice I would support tougher penalties on a person convicted of murdering a pregnant woman as opposed to murdering a regular person, simply because it wasn't their right to terminate the fetus. Even though I don't believe the fetus qualifies as life, it has the potential to become a human being and murdering it infringes on the rights of the mother to have a baby (but not on the rights of fetus itself, as personally I believe the fetus does not have rights until it is 20 weeks old or so).