I guess the first question is whether it’s the restaurant’s fault. The mere fact that some leftists came in and created a disturbance doesn’t mean the proprietor condoned it... even though it is DC.
What they need to do is photograph the perps and let the world know who they are. Blaming the wrong guy doesn’t accomplish anything.
I have yet to see a restaurant like this which allows a large group to just waltz in w/o encountering a receptionist, a maitre de who would intervene “Do you have a reservation?”