Finfly
I'm not sure where you are coming from.
Air accidents specific to any one aircraft type and or airport are rare incidents and therfore unusual events.
Unfortunately in all too many cases the investigation ultimately reveals causal factors that we have all seen before, albeit under slightly different circumstances, thus making it a bit more common to us even though it was not expected for that specific flight.
Since I'm not aware that any characterization of likely causal factors has been identified in this accident or even other factors ruled out I can not yet relate to your characterization of unusual
Perhaps this is what has caused the problem in interpreting what you meant in the other forum.