What if the government can figure out if you are having an extramarital affair?

Irv Lachow, the CNAS cyberfellow, said it is plausible that
metadata could be used to figure out who is probably having extramarital
affairs. So, he said, what if the government wants to develop a list of people
with security clearances who are engaging in affairs and so more susceptible to
blackmail, emotional stress, or financial trouble?

His point is that we need to think this through, and focus
not on what is legal, but on what is ethical and wise. I agree.