If I'm committing a fallacy, it's probably just assuming that individual American IBM executives probably wouldn't have actively and knowing facilitated genocidal policies. Also that if German IBM employees did do so, that's on them, not necessarily US execs who may have had no knowledge or awareness of it.

That turns out to be false though, it's seems apparent that US execs had a pretty good idea what their machines were being used to do at last up to 1942. Not in detail, they probably weren't aware of the specific activities happening at say Treblinka, I don't think anyone in the US did, but they were aware that German government policy was the registration and oppression of Jews and other minorities and that IBM machines were facilitating it.

You pretty much just hoped something wasn't true, even though references were easily available, so you started making excuses, caveats and assumptions instead of following up on those references. Really what was your comment going to achieve?

Your fallacy is to repeatedly make assumptions in favour of the US without any evidentiary basis. When history is as well studied as it is, there's no need to propagate your assumptions.

Now you're at it again - I just Googled "when was us aware of the holocaust" and found an interesting Time article. There were already rumours of mass killing. And the existence of concentration camps, ie not merely "registration and oppression" but active imprisonment, was very well known. The number of victims was underestimated in the common mind - but IBMs contribution of record keeping systems was to help increase that number.