I find it strange that especially the US-Americans in here find it so easy to scream murder over abortion, while you don't seem to be very vocal about the death sentence that your country still practises.
If noone is allowed to end another human beings life by purpose without really being threatened, there are some other examples going on in your country that are jandled very differently than abortions.
1. The practice of death sentence. This is murder for murder. So, it is legalised murder.
2. Gun laws. An example, a new (Old school-) gun law in Florida, that allows to use deadly force if people have the feeling that they are threatened. So if you walk over someone's backyard, maybe not even knowing you are on someone's land, it is okay if the possibly paranoid owner has the impression you look foreign, threatening or whatever, he can just shoot you down. That is insane.
http://www.washingtonpost.com/wp-dyn/content/article/2005/04/25/AR2005042501553.html
3. The USA and so many of its people feel actually proud of their government and soldiers that went to Iraq and killing thousands of their people, though the Weapons of Mass Destruction never existed - we learned through the past years that Blair+Bush knew those WOMD never existed in the first place, and needed a fictious reason for bringing death to a whole country. Murder. Everyone that was involved in planning it, and everyone who still fights that war while knowing it got started for a lie is partaking in murder, in my opinion.
Finally: If you are not okay with a law, go and change the law. If you take laws in your own hands, you are the criminal. Not the person who goes by the law.