Earlier quoted context omitted.
I‘d be interested in knowing of any cases where someone who recorded their own activities used it as an alibi. Right now it's all theoretical. Dash cams are really strong evidence in traffic court, but this isn’t criminal so it has a lower bar. From the other end, body cam footage is powerful when worn by police, and cell phone evidence by bystanders are also strong evidence.
Time is really critical. Alot of police investigative work is about stitching camera footage together in a timeline. I served on a jury where a case was built around camera evidence immediately before and after an event. Of about a dozen relevant data sources, only one had verifiable, correct time. The defense was able to impeach that evidence, and the whole case collapsed. A dude got away with manslaughter.
If the presented evidence failed to prove his guilt (brd), then he didn't so much 'get away with it', as sufficient proof was not presented to prove his guilt.
Sorry to put words in your mouth, but it sounds like you thought he did it? Which, isn't necessarily a bad thing, as there are balances in the system that prevent you from being the sole judge, jury and executioner regarding the situation.