Actually, the problem is that I have listened closely to what you have said and have closely read the abortion statement that your branch of Lutherans have put out. And both are inconsistent and self-contradicting.
I completely agree that those with actual intellectual integrity have enough humility to recognize that they don't know everything. I certainly don't know everything. But, and this is very important - those with intellectual integrity at least hold to consistent beliefs that are not self contradicting.
So pulling this back to the abortion discussion...The Evangelical Lutheran Church in America's position on abortion. I must say, they actually get something spot on.
"Human beings, created in God’s image as male and female (Genesis 1:27-28), are persons of intrinsic value and dignity."
"All of life is a mysterious, awesome gift of God. Biblical passages express the God-given mystery of creation (Psalm 139; Jeremiah 1:5; Isaiah 40:26ff; Luke 1:41; Acts 17:24-25). God creates life, redeems it through Jesus Christ, and fulfills it in the coming of the reign of God. Personal human life is a part of this divine drama. God creates a human being through complex genetic, physiological, and relational developments.2 Human life in all phases of its development is God-given and, therefore, has intrinsic value, worth, and dignity."
The first thing I would point out is that in the first quote, there is no distinction made between a human being and a human person. It seems the Lutherans accept what we already know, which is that all human beings, from fertilization are created in the image of God and possess intrinsic moral worth and value.
And this really is the key point to the entire discussion over the morality of abortion. Our moral worth as humans is derived from God. We don't have to be a certain age to acquire moral worth and value. We don't have to reside at a certain location to acquire moral worth and value. And we also don't have to come into existence by a certain way in order to acquire moral worth and value.
And if we possess inherent moral worth and value, from our very beginning, I honestly cannot come up with a morally valid reason for 98.5% of all the abortions committed in America which are done for convenience purposes.