Surveillance has become a “one-way mirror.” We’re being watched but can’t watch back.
In this statement, the author is using pathos to stir emotion out of the reader. The author explains how surveillance has mostly become a one-way thing and how even though we know we are being watched, we can't do anything about it. I think these lines make the reader feel insecure and helpless, which can later lead to the reader feeling scared. I believe the author implies the negative impact of being under surveillance (knowingly/unknowingly) and not being able to do anything about it by using a serious tone.