Signal is the way to go, been successful in moving my family, two friend groups and girlfriend. Any other closed source non encrypted messagers will collect all your family informations, news, pictures. This should be convincing enough for them
I do agree with you point and opinion, but that “logical proof” is one of the worst I’ve read.
The “Nothing to Hide” argument could be restated that way:
Axioms:
A1: Surveillance reveals hidden things
A2: If I have something to hide, I would be concerned if it’s revealed
Propositions
p: I have something to hide
q: I should be concerned about surveillance
We deduce from the axioms that p => q : “if I have something to hide I must be concerned about surveillance”.
The logical fallacy of the nothing to hide is to deduce !p => !q : “If I have nothing to hide I should not fear surveillance”. Which is a case of Denying the antecedent fallacy.
Another fallacy of the argument is that they suppose !p is true, which is a debunked fact.
What was wrong with your proof was that you used another human to disprove a fact about the first one. The I may not be switchable because the other human may not have the same axioms. Moreover, you statement was about “should” but if someone doesn’t do something they only should do, it’s not a contradiction
Heliboard is decent