Lets talk probability not luck. You make your luck. More and better training less chance of a disaster.
True to a point. However there are some things that are just 'luck'.
For example QF had a complete electrical failure which just so happened in daylight on climb so they had enough time to fly back on the battery. If that happened in the middle of the night in the Pacific it could have been very different. QF 32 had 3 captains on the aircraft...... What are the odds of that?
The Emirates incident in MEL came within about 20 feet of crashing. What's 20' in an aircraft that big? If max thrust was put on 1 second later it would have been a fireball.
So yeah you make you're own luck to a point but then there is just pure luck/fate/destiny or whatever else you want to call it.