Expecting "perfect solutions" is absurd. Technological solutions can mitigate some risk and politics can mitigate some danger. Someone sufficiently powerful CAN still remove your privacy, always, but the goal is to make it hard enough that no such entity exists who might want to do it. Its a lot easier to remove the privacy of a jail prisoner in a third world country who uses plaintext and no password. It is a lot harder to do that to someone if they have encryption, AND the power of a nation state and/or a society ready to defend their privacy with ample force.

But the real reason technologists focus on the tech is because it is their area of expertise.