There were over 5000 auto thefts reported last year[1] in an area that has about 350k registered cars. Statistically speaking, more than one in a hundred cars were stolen in one year!
Similarly, there were roughly 26k cases of property crime reported for an overall rate of property crime victimization of 3-4% of the population.
If I lived in DC, my day-to-day life would be affected a whole lot more by this level of disorder than a political event that took place on one day in one building. Of course, you're free to value things differently, but it's an indictment of how much antisocial behavior some Americans are willing to tolerate that people are shocked by the statement that "crime in DC is bad".
[0]: https://en.wikipedia.org/wiki/List_of_U.S._states_by_intenti...