Authoritarian regimes don’t run on facts. They run on the primacy of Authority. Cameras record factual information. Facts are inconvenient for Authority. You know, 1984 Department of Truth style.
In reality they are very much interested in facts, because they give them info who to oppress harder
The goal is not to accurately target people, the whole point is you don't care. The exercise of power is the point.
It doesn't matter who's door you kicked in: you were right to do it no matter what, and they were guilty no matter what.
They don't need it, but it's convenient.