Hi. I would like to preface this by saying that I am a pro-life Catholic, and I always have been.
I want to discuss the evil of abortion. I notice that many pro-lifers get hung up arguing about the evil of murdering babies, whether or not a fetus is a human, etc., and they fail to see the greatest evil of it all: the idea that one human life has more intrinsic value than another. This idea has manifested itself through all of human history: as slavery/racism, Nazism, and today, abortion. Slavery in pre-Civil War America was rooted in the idea that a white person's life was more valuable than a black person's life. Once this idea had been accepted, whites (not all whites) could then attack and dehumanize blacks to the point where they would consider them as property, not people. And once they did this, once they reached this point, they could justify the rape, beating, and enslavement of black people "because they're only property, after all."
Similarly, as you most likely already know, Hitler had the idea that the life of an "Aryan" was naturally more valuable than the life of a Jew. (Of course, if you were to ask the Internet why Hitler hated Jews, it would tell you that he believed "Jews were a destructive influence in any society." That comes from the aforementioned idea.) When Hitler came to power, he gradually passed laws restricting the rights of Jews. He eventually began to treat them like cattle, marking them with the Star of David (and numbers at concentration camps).
Hitler felt justified in killing millions of Jews because he had dehumanized them to the point where they were barely more than cattle.
Abortion today is akin to a "sibling" of racism and Nazism. All three are manifestations of the same horrible idea. In order to justify abortion, you must first accept that the life of the mother has more intrinsic value than the life of the baby. Once you accept this, you can dehumanize the baby to the point where you can justify its murder by saying that it is "only a cluster of cells." Furthermore, you can then divert the argument away from the root of the evil and point it elsewhere, wasting time arguing about whether or not a fetus is a human.
In retrospect, we know how evil such things as slavery and the Holocaust were. We look back on these evils and we swear to never let something so horrible happen again: and yet it continues, right before our very eyes. Why do we never learn?