There's no major American subculture in which stepping out on your wife behind her back is "a good thing" or even "an okay thing". A vast majority of Americans poll consistently against adultery and is often the single most universally condemned actions in surveys. Here's one example: https://news.gallup.com/poll/692801/adultery-cloning-seen-im...
> There's no major American subculture in which stepping out on your wife is "a good thing" or even "an okay thing".
No, there isn't.
There is a significant part of American culture that separates personal life from professional life. IE, an affair is treated as a private matter to be handled by the married (or committed) couple. (IE, this is why many people in this thread focus on Huang's job performance over the affair.)
And I agree with the latter: The affair is a matter between Huang and his wife; it's a signal of his trustworthiness and honesty, and raises concerns about national security. But beyond that, it's not my place, or your place, to judge.
Please don't make the mistake of assuming that American culture is homogeneous: It's not.