This is completely overblown. The point NRO is making is a good one. People do bad things all the time and it is often not from lack of sense or carelessness or poor logic. To dismiss genocide as "senseless" cheapens the whole affair and gives us a false sense of security that "we could never do that".
I think you're giving NRO too much credit. This wasn't some deep philosophical analysis decrying the a casual lack of concern for the real causes of the Holocaust. (As pointed out above, Saint Reagan said virtually the exact same thing with nary a peep.) This was, "Obama said something, let's find fault with it."
I also couldn't help but notice that while Eliana Johnson was quoting parts of the Nazi program, she just happened to leave out all the ones attacking cultural and financial elites.
What is that supposed to demonstrate?