There are multiple elements to unpack here. The obvious pre-crime problem other commenters raise. The fact that terrorism is such a rare risk it isn't worthy of

There are multiple elements to unpack here. The obvious pre-crime problem other commenters raise. The fact that terrorism is such a rare risk it isn't worthy of our attention. But I'd like to raise another objection: Homomorphic encryption does not provide integrity over the ciphertext, which could open the door to active attacks against the systems that undermine its privacy goals. https://news.ycombinator.com/item?id=14443191 https://news.ycombinator.com/item?id=14443191 https://paragonie.com/blog/2016/08/crypto-misnomers-zero-knowledge-considered-self-descriptive https://paragonie.com/blog/2016/08/crypto-misnomers-zero-kno... If you really need to build such a dangerous and needless system, would you want it to be built with such an error-prone cryptographic design? I'd say "No".