It's good to apologize for being late.
Mark is running late to his work meeting and arrives 10 minutes after it started.
Mark wants to look good at work.
Mark apologizes for being late to work and proceeds with the meeting.
Mark says nothing about being late and steers the conversation towards himself.
Mark's boss is understanding and thanks Mark for his apology.
Mark is seen as rude and disruptive and his reputation at work is harmed.