I know its starting to really look scary, but I feel any left winganarchist nutjobs will be dealt with and law and order and stability is still strong. the race riots of the last couple of years were cases of politicians simply not allowing forces to do their jobs, which was more than lenient and compensating for protesters than one would expect.
now combined with clear improvements in discipline and training for tense situations, as well as public relations and documentation, Law and Order is certainly prepared to keep things in line and still have the support of the vast majority of Americans and federal agencies
in all seriousness, letting congressmen go to a park essentially unprotected is quite ludicrus in this day and age, and like it has been stated, it was sheer luck protection was there today, else this would have been a massacre and we would be under martial law at this very hour, its still hard to comprehend just what the hell we just avoided this morning...
but aside from this nearly unprotected inccident, which law enfrocement responded to very well, I still have faith in emergency services