What they said was: people who created the list went off on some weird tangent about the list being the first step towards genocide, if you have a problem with the list, you shouldn't contribute to the list (the subtle point here is that people who tend to be most active about these things usually feel guilty, management said the list was bad, management said it shouldn't have happened...what more do you want? Are you really saying that suggesting the list was genocidal is a normal response?).
Circulating a list like this would happen everywhere. Every person believes they are above other people when they see other people behaving badly...funnily enough, bad things still happen because people think they are different from everyone else (understanding this point is a big step is the difference between managing yourself and having to manage other people...things happen, people make mistakes, they do things that they wouldn't normally do...once you manage a large team, the probability of weird things happening goes to 1).
Btw, just as an aside, this whole discussion is going nowhere. I can only see this from my own perspective but most people have literally no knowledge of history, they have no knowledge of debate, they have no idea how to engage with other people in good faith. The reason why so many organizations have rules about not talking about politics is because, once an organization reaches a certain size, these discussions become impossible because the average level of a discussion is just so terrible (and there will always be a minority who actually don't want to engage with anyone else, they just want to burn it down). Ironically, this is essential to improving diversity in large organizations...but, irregardless, this discussion is pointless and will go nowhere. We will never reach a point where the complaining stops because the complaining is not related to anything outside individuals...it is just nothing (and a huge part of this is people feeling guilty).