system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why is there no CCTV on Starships?

There is one instance in The Search for Spock where they look at video and it’s framed exactly the way is was in Wrath of Khan with close ups and everything. There are also some video or holographic recreations they sometimes do, but so many crimes and murders take place with no primary evidence.

CCTV would solve almost all of the mystery plots they have in the series and Star Trek 6 would’ve been over in 5 minutes if either the Bird of Prey or the Enterprise had video cameras.

The onboard computer can track people on board but it sometimes seems limited to communicators rather than biological signs.
gpt
The enlightened people of the 23th and 24th century have concluded that putting cameras everywhere is an invasion of everyone's privacy that only breeds paranoia and mistrust.

As for the suspiciously good video evidence we sometimes see in Trek: 

I personally think that it's actually just a really advanced simulation based on the ship's log. That would explain the impossible camera angles and how they can look at things that happened on an alien planet.