That’s an ideal. Few groups have either the personnel, training and discipline, or money to afford all the bells and whistles.
Other problems are the “herd of gerbils” you are protecting, who are an unpredictable and often random assembly; as well as agents provocateurs (or agentes provocatrice (female)), who it is now developing were on both sides at Charlottesville, stimulating the confrontation. *And* a hostile government, willing to either pull out the police at the worst moment, or even order the police to attack your group, leaving the enemy unmolested.
There have been instances where comms were cut off by deactivating cell phone towers, or even jammed. They are certainly going to be monitored. This means you may be limited to just hand signals.
Finally, terrorist acts are increasing at an alarming rate, which could easily include snipers and bombs. And of course, an extremely hostile media.
These are indeed the problems, among many others. These difficulties exist whether the organizers plan for them or not; that is why we need to plan for them.
It is a truism that ‘no plan survives contact with the enemy’, be that enemy human opponents or natural forces. Still, that is not an excuse to avoid planning and preparation.
What would you recommend to the sponsors of a conservative or patriot rally?