I love this objection because it uses my own argument against me. I think any argument from here goes away from moral principles and towards politics.

My personal view is that rights are most greatly abridged in crises, and that the voluntary cooperation is less likely to beget oppression than is the unrest and crime prevented by cooperation. Moreover, I think a culture of forcibly requiring information is more likely to arise in a culture of reticence.

You're right that it's a difficult line to walk, though -- defending a cultural value of openness and strong rights to silence and privacy is a subtle point.