Quite. In the Star Trek example, the Captain can say "Computer, locate X", and sometimes he says "Computer, deactivate X's devices" and the computer just does it. It's very unlikely, because he's an idealized fictional hero, that anyone with that kind of power in the real work, is as wise and benevolent as Picard - and even Picard makes mistakes.
1. Other characters can and do ask for locations. This is apparently considered non-private information.
2. As open and utopian as the Federation may be portrayed to be, Picard is still the commander of a military vessel, so I wouldn't be surprised if in other contexts, computers give out less personal information and grant less power to administrators.
