Abortion is the single greatest injustice occurring in the world today, and so we should be against it. There’s nothing wrong with making the positive case for being pro-life, but you can’t be truly for something and not be against that which destroys it. A man who says he loves his wife but won’t defend her, doesn’t. Similarly, “To fear the Lord is to hate evil”. Abortion destroys innocent human life, and therefore if you are for human life, you must be against abortion.