It's ironic that your argument against associating privacy with criminality is citing an example where privacy is seen as morally necessary specifically because the acts one wishes to support have been criminalized.

It seems to me your problem is more with the association between criminality and moral wrongdoing than that between privacy and criminality.

Who is going to be the perfectly moral individual or organization who will be able to fairly distinguish between that which is moral but illegal and that which is immoral and illegal? The answer of course is that no such entity exists nor will exist. And you cannot stop the latter entirely without also halting the former, and halting the former is arguably worse (but that's debatable, especially if your opening argument is "Let's take mass child slave trafficking.")