Exactly. We are not talking like its a binary choice. No one ever said if you don't drive a ford, you then MUST drive a GM. There are many, many different choices to choose from.
Like running a democratic nation, there are many different choices and ways to adapt to what is best for the overwhelming majority.
Only an armchair theoretical no real experience academic (or wanna be) would ever advocate in any way (directly or indirectly, or implying) that killing in mass was a good idea. I ask that person, have you ever killed anyone or any living thing? Have you ever uncovered a mass grave? Have you ever picked up a cold dead body and felt how weird it is? Maybe to that individual, you really better look in the damn mirror and think 5 times over at least about what your thinking/saying or even hinting at.