Who is this historian?
you bring up a really good point and that is God's sovereignty...using both the evil and the good to accomplish his plans in the world yet I can see why people object to the term "necessary evil" with regards to the holocaust. i consider a necessary evil something minor like a shot maybe or a diet but not when millions of people are murdered.
Alas, I don't remember. It was a historical magazine in my doctor's waiting room !