You ever ran late to a college class because you had to stay longer than scheduled at your shitty retail job to cover your perpetually late coworker who was supposed to relieve you?
Sometimes running 10 minutes late is no big deal, but sometimes it is. It becomes a problem the moment it causes someone else problems.
Yes, the business is responsible for their poor decisions jus the same as the tardy employee is, one does not absolve the other.