I'll come out and say it; I think the reason most people--if they honestly admit it--don't feel as horrified at the thought of abortion as they do to say, the murder of five year olds, is because it is hard to have feelings for an unborn child that we've never met, that has no personality, that we can't really relate to, since we've all been around small children, but never an unborn child. That being said, as much as I hate to admit it, I would have to disagree with Orthonorm that ethics are related to these feelings. True ethics to me are independent of our feelings and emotions, because our feelings and emotions are subjective, change and are determined by our culture. If God is unchanging, and morality stems from God, then it seems logical to me that morality also must be objective and unchanging. And that brings me to my next thought; even if we have a harder time feeling sympathy for unborn abortion victims, it doesn't necessarily follow that abortion isn't murder, or at least bad--rather, it says that we've been raised in a flawed culture that has engrained its immorality upon our souls, masking our ability to recognize God's true morality for us. There was a time when people thought that killing a slave, a poor person or a person a different color than them wasn't murder, but just because they thought something doesn't mean that they were right. I imagine that abortion is somewhat similar. This is also why I would disagree with many Evangelicals who are in love with CS Lewis' weak moral arguments; I don't believe that morals are something we are born knowing, but rather, they need to be learned through living the life of the Church and putting wickedness aside. I don't trust our "feelings" or "intuition" at all as having authority to determine right or wrong.