Ask any criminal lawyer, police officer or psychologist if what multiple people say they saw of the same event ever matches to the detail.

Anybody who ever dealth with witnesses knows that what people "see" is to a great extent what they expect to see.

(In your example - “The antifas burnt a guy’s car with a molotov!” - what exactly led that observer to believe the perpetrator was antifa? That small and simple sentence of yours is not objective and already includes drawing conclusions based on the observer's own assumptions)

People are already interpreting things when they see something and usually store into memory their interpretation of things, unless we're talking about one of the rare individuals with perfect photographic memory.

There is a big long running discussion about Subjectivity and Objectivity in Phylosophy and so far most people think Human Beings are incapable of being completely Objective.