Some skiers are highly irresponsible and flat out ignore the avalanche danger when skiing conditions are tempting.

Others are very knowledgeable and will make every precaution nescessary to reduce the risks to an acceptable level.

From the video I can't tell which group this skier belongs to. But aparently they had the last layer of defense in order (go down one at the time, always bring avalanche beacons, showels, probe).

The other layers include pre-trip planning, heed the avalanche forecasts and continuous assessment of the dangers throughout the trip, as well as choosing the optimum track down the slope. Even if you do everything right there is no guarantee you won't get caught - it's just about reducing risks to an acceptable level.