Simple. Please give a reference to your 50 million abortion math (which is absurd.) Further, living, walking around, people were killed by the Nazis, with children, brothers, sisters, and parents, an abortion is pre-life and just a women's guts.
Why are you comparing to the holocaust? 6 million people who were alive and supporting the economy were brutally murdered and rounded up. In contrast fetuses are willing aborted by their mothers and doctors who receive permission to perform an operation. More people have died of hunger! What is your point?
It is true that millions of fetuses and even babies in the final stages of pregnancy are being killed which is murder. However, there is no systematic system to forcefully kill children. It is a case by case scenario. Mother's are coming to the doctors not the doctors coming up to them. The parents who are choosing abortion are the real murderers not the doctors. For doctors it is just a job. Are doctor's responsible for killing unborn babies? Yes. They are also murderers. But the government is not at fault. The state or federal government may have legalized it but they are not acting it out.
It's an entirely different situation. There is a difference between being forced to kill and mother's willingly going through abortion. An analogy may be a spider entering into another spiders web and cannibalizing another spider and its young and a spider that eats its own young. If every species of spider does it, can we compare this to one species of spider wiping out all other species of spider it comes into contact with? No. Apples and Oranges, these are two different subjects.
Another example - Did humans wipe out the Neanderthal or did humans simply drive the Neanderthal to its own extinction?