You don't need a permit to exercise your 1st Amendment rights and they weren't there to shut down emergency services. You can say the same thing for other crowds such as college bowl games, festivals, etc. If that were the case, the police would shut down ANY TYPE OF PROTEST CITING THOSE SAME REASONS.
You don't need a permit on PRIVATE property or designated areas. You do need a permit to block roads. You think the rose bowl or any St pattys parade or pride parade or fucking marathon - even suburban white block parties- don't have permits??
And how many times have the Blm "peaceful protests" courted troublemakers?
The ice you are holding in your hand isn't causing the frost bite, the cold is causing the frostbite. Either way drop the ice.
And the sad part is a majority of blm protests (in my cities, anyway) that are lawfully planned and that will create exposure... Just get a little money sprinkled at the top and the protest goes away.