When a parent drops off a child at a daycare center before work, they are placing much trust in the facility. Parents expect the center is in good and clean condition, the staff is properly trained and background checked and children are being properly cared for and supervised at all times.
While it is true that most parents will choose to tour several daycare facilities before selecting one, they are still placing a lot of trust in management and staff to keep their children safe. The problem is compounded in big cities, where daycare centers are often lacking any vacancies and you have much less choice in where to send you child.