That is crazy. Anarchy is not a positive thing.
The cop has 2 options
1) walk away & ignore it
2) Try to make an arrest. Which will most likely turn violent. He might need to use force, somebody could get hurt (or worse). Everything’s recorded. He now faces departmental hearings & perhaps even federal investigations. The media publishes his name & now he & his family receive death threats. He’s guilty until proven innocent, he’s guilty even when proven innocent.
Which would you choose ?