The Nazi stance on abortion wasn't "liberal", that's ludicrous. It ranged from being forbidden for parents of German blood to encouraged or even forced in other cases, it was all about their ideas of racial hygiene. Not even the GOP is that racist, or can you imagine them mandating abortions for mixed-race couples?
The only case where this might be true is even the ban on abortion for German couples did not mean a ban on abortions in medical cases. German (not just Nazi) law generally considers it, as is proper, self-defence. Honestly I don't think a legal system which doesn't consider it such can consider itself a legal system at all, Radbruch and everything.