...where people regularly flaunt all the rules completely on purpose. It doesn't seem particularly unfair to look there first, no? It's a bit like harsher punishment for repeat offenders - yes the thing they did isn't different, but there is often an element of "doing it repeatedly and on purpose" in prosecution of infractions.

Which are exactly "all the rules" at a protest besides a minimum distance?

It does bother me when the police is enforcing one thing ( the distance ) because they want to break another thing ( the protest ).

All applicable Coronavirus related rules. Masks and distance, specifically.

Are masks mandatory when you are outside ?

At demonstrations, they are.

When a protest involves deliberate, nonviolent violations of law, it is better described as civil disobedience. If you engage in civil disobedience, you should be prepared to face the consequences, and argue why the law is bad to a judge. Civil rights activists have known this for centuries.

Did the protest involve deliberate, nonviolent violations of law besides possible violations of the minimum distance ?

This is not clear from the footage.

> besides possible violations of the minimum distance

That would be the law in question.