Ah, I see. According to you, the cops came to deep-six any fishmongers that may have been in the crowd of drug-dealing criminal gang members. And upholsterers. Someone tipped them off that upholsterers and fishmongers were gonna be at this meeting of criminal gang members, and the jackboots jumped at the opportunity to ventilate them.
The USA still prohibits guilt by association.
If this was a turf summit to divide up illegal activity then the police should have just had a warrant, recorded this, and made arrests later when this fiasco could have been avoided.