Casual dining

Today I ate lunch in a "casual dining" place, a nationally recognized chain restaurant. I always wonder why the host/hostess sometimes think its acceptable to make a 5 person seating arrangement out of a 4 person table. They like to do this a lot and it is highly unacceptable to me. I was eating there by myself but the adjacent table had 5 people seated and the table was only built for 4. Cause the stupid hostess had placed a chair on one end and thought it would be OK. The people thought it was ok, but you could sense that secretly, they loathed it.