Your rebuttal to engineer’s disease is to quote Ken Thompson

From Michael Parenti’s Dirty Truths:

Those who suffer from conspiracy phobia are fond of saying: “Do you actually think there’s a group of people sitting around in a room plotting things?” For some reason that image is assumed to be so patently absurd as to invite only disclaimers. But where else would people of power get together – on park benches or carousels? Indeed, they meet in rooms: corporate boardrooms, Pentagon command rooms, at the Bohemian Grove, in the choice dining rooms at the best restaurants, resorts, hotels, and estates, in the many conference rooms at the White House, the NSA, the CIA, or wherever. And, yes, they consciously plot – though they call it “planning” and “strategizing” – and they do so in great secrecy, often resisting all efforts at public disclosure. No one confabulates and plans more than political and corporate elites and their hired specialists. To make the world safe for those who own it, politically active elements of the owning class have created a national security state that expends billions of dollars and enlists the efforts of vast numbers of people.

As for email, you say that as if Edward Snowden revealed nothing, or that the US doesn’t have a history of injecting backdoors into encryption standards.

The ones that don’t choose to may eventually find themselves defederated from the ones that do. We’ll get walled off from the large instances that “play ball”.