Criminals or homeless or nut cases.
In Feb. 2019 I was supposed to pick up my (now late) wife after work in Center City, but got stuck up in Monroe county due to car trouble.
She had to find a safe haven in the Walnut Street area, and tried Burger King for awhile, but after work hours the sanatorium brigade takes over and practices their drama inside various establishments. Apparently Burger King is a favorite.
The manager came out and sat with her because he could see she was scared, and then he suggested she go to a yuppie bar across the street. Was finally able to pick her up around 10 pm. Apparently he cannot, or is reluctant to, evict the marginals.
Boy was she pissed when I finally arrived!!