LAPD are trained and regularly used for crowd control and protest dispersal. The guard isn’t. And for sure the Marines have no clue about policing.
I think LAPD is choosing a 1st amendment violation as the lesser failure than permitting any escalation involving the National Guard. That would quickly turn out badly for the guard, become a pretext for ever more violent authoritarianism in response.
it's the feds and the sheriffs and the police causing unrest, by intent and design.