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Why would infomation systems for tracking tattoos on not-Aryans in work and death camps be a problem?
Why would developing and selling Zyklon-B be a problem?
By your comment above, and I quote: "Why would taking on paying customers be a problem? It shows they are running a business".
Do you truly believe that making sales and profit is all that matters?
The counter example was of businesses that aided in war crimes.
The question posed was whether "business trumps all as long as it pays" is an absolute or whether there are qualifications depending on the type and application of paying business.