I work in child care and the regulations behind this are fucked. There's no gray area and staff risks prison time for not following them. I get how these laws and regulations get implemented. Even "good parents" will think it's completely reasonable to be late to pick up your children. Once in a while isn't a problem but when you are in charge of hundreds of kids and too many parents have that mentality it creates a cascade of issues for staff. (child care works have lives too) so please contact the school/facility if you are going to be late and don't be late constantly.