> 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.