Reminds me a bit of an experience I had at an event around 2000 or so. Most of the folks there were heavily academic, but at lunch I found myself sitting with one of the organizers who was clearly cut from different cloth, so I asked what he did the rest of the year. After a couple of rounds of vague responses about how he helped companies use email to get in touch with potential customers, it finally dawned on me that I was sitting at the table with a SPAMMER. Pretty much lost my appetite at that point.

My takeaway is that spammers, malware authors, even identity thieves, are among us. They can seem like perfectly nice people. They might even be perfectly nice people except for this one bad habit, this one ethical blind spot, that enables them to do things from which the rest of us would recoil in disgust. The company in this story might be an extreme case, but I'll bet a lot of people asking "how could they not know" have themselves worked at companies that made at least some of their money in less savory ways. Sometimes it might be why that company survived while contemporaries faded away. Silicon Valley from its earliest days has been full of people who benefited from carefully redacted history, whether they knew it or not.