Most likely because of what you said. In-universe explanation: no one was around, so it might have assumed it didn't need to mimic the specific individual, only the uniform. Perhaps?On another note, can someone please explain why the T1000 didn't take the likeness of the cop he killed at the start of T2? Did Cameron not want to reveal its capabilities until later in the movie or was Patrick's likeness the generic look of the T1000's?