That’s not proven, the reporting that no one helped Kitty Genovese wasn’t being truthful (and I’m bummed Watchmen 2 hasn’t corrected this). There are multiple ways you can help someone. If that way is filming someone who asks to be filmed in protest and that’s the route you decide to take especially if there are many people around and so many options and suddenly you’re thrust into a crazy scenario recording that scenario might be helpful later, or it might not, hard to say because HEY THAT GUYS ON FIRE. QUICK DO SOMETHING. MAYBE. Maybe they’re terminally ill and they want to die like this. Maybe this is some stunt, maybe he’s mentally ill but can’t be admitted against their will until there’re a proven danger, best to document that. It’s an uneasy calculus and filming people in distress like when they’re with the police is not always the worst option.