It gets worse. Google what IBM did for a certain country in Europe during the 1930s and 1940s (yes, after the invasion of Poland).
What we should study is how these companies successfully laundered their reputations, such that we can hold modern corporations accountable for conspiring with genocidal or dictatorial state actors. This does not solve every ethical problem that underlies the contemporary corporation, but I believe that companies that are complicit in the mass extermination of human life should face the consequences. Hopefully, we're on the same bandwidth here.
The only change I see working is to hold accountable not just the companies themselves but the decision makers too.
In any case, how people act is largely a consequence of their environment, i-e, the system. These can be environmental, political (as in, power relations), cultural, etc...
Stop leaning on this, because it's not true, just a cop-out.
Individual corporate humanism isn't a crime.
But even when it isn't, it is a sub-optimal strategy compared to maximizing as long as those that make the decisions have differing interests than those that bear them. And if they do not have differing interests, then why separate them?
Anything done today for crimes 80 years ago will only serve to hurt those that weren't even around, and not really help those that were harmed.
The reality is that companies aren't people, and despite the concept of corporate personhood shouldn't be treated like it. Nobody working in or managing a corporation today was likely a part of said company during WWII.
Beyond the above, Sometimes "companies" have no choice. If your company, and its' resources, employees, etc. exist in a totalitarian regime, you're kind of stuck. If the country's leaders are willing to kill and replace you, then most people would simply comply. Many that worked in these companies during WWII passively resisted by slowing things down and hindering projects. Not enough to get them killed, but enough to keep things from going as bad as quickly as they otherwise would have.
A company is made up of its' people, from the leadership down... and that changes over time. Trying to hold a company to something done 80 years before is kind of meaningless. If it was called for and/or done at the time, or nearer the time that's different. Like many things, at some point you need to get over things that happened before you were born and concentrate on the now.