Nowadays airlines accept too many destinations/airports with insufficient equipment or indeed none and still send their crews to pick up the tab.
This could happen to a crew after having been dealt with a lousy week of schedules, weather etc. and a lot of fatigue and grief.
This is unacceptable and the 'mistake' by this crew should make all cost cutting airlines sit up and smell the coffee.
But it won't, so this WILL happen again, as so many have written above!