Do you think he would have joined in an alliance with Stalin to butcher fifty million British babies?
If Hitler threatened to butcher fifty million babies, and Stalin threatened to butcher ten million, he'd have said "hmmm... forty million saved" and picked a side. Me too.
Here's where rubber meets road. If you choose to save no babies until you can save them all, then those who might have been saved by compromise in the interim are partially your responsibility. Do you accept that responsibility?