I've commented it in the other post, but in my opinion, the issue of the "nothing to hide" -> "no worry in showing" statement is that in between lines (specially in the context for which it's used) it seems to want to imply that having something to hide must be something rare or perhaps wrong.. as if it were not possible to want to hide things that are good for society to keep hidden.

This isn’t a formal, logical fallacy, but an informal one: https://en.wikipedia.org/wiki/Informal_fallacy

From a perspective free of presuppositions and biases, I don't think the logic of the argument on itself is wrong, because of course I wouldn't be worried about my privacy if I had no interest in keeping my private information hidden.... but the premise isn't true here! the context in which the argument is used is the problem.. not the logic of it.

It's not incorrect to say: "nothing to hide" -> "no worry in showing" ...what's incorrect is assuming that the "nothing to hide" antecedent is true for all law abiding citizens ...as if people didn't have an interest in keeping perfectly legal and legitimate things hidden and safe from as many prying eyes as possible. The fallacy is in the way that it's used, they are pretending that this means people shouldn't be worried, when in fact it means the opposite, since everyone does, in fact, have information that should remain hidden. For our own safety and the safety of our society! ..so everyone should in fact be worried about breaches in privacy.