Abortion, to its supporters, isn’t really about the law, or philosophy or medical science. It’s about sex, and the right of men and women to ‘hook up’ freely and without consequence to them.
It's about a lot more than that.
It's about teaching people that they should not be responsible, that they should just engage in whatever behavior their instincts lead them to, without any attempt to act civilized.
It's about driving home the point that no individual human has any worth, and that a human's only value is in the labor they provide to "society." And, by extension, it's about giving the message to every person who embraces abortion that they, too, can be just as easily snuffed out once they no longer provide value to "society."