Thousands of people want to go the same way at the same time. They choose to walk. They spill into the street naturally as a way to move more people efficiently. They are arrested for blocking auto traffic.
If each of these people had a car. How long would the blockage have lasted? We don't know. But there would have been no arrests.
Next time, gamble with other peoples money, cause financial meltdown, bring a car, and you will be safe from arrest.