Nature is pityless -- woman sucked out of plane.

[Anomalocaris]

I'm assuming a 'cruise' power setting for the engine, not a full throttle period like during takeoff or a go around, and find the uncontained failure even more disconcerting.  News reports are mentioning fatigue failure.  There will be individual manufacturing records for all the parts on the engine, they will all be examined.

I am not sure if a contained failure In this case would be better than an uncontained failure.  If the failure of the fan blade is contained, then the remains of the blade would have a high chance of being ingested by the engine.   Sending a big chunk of a fan blade into the compressor and hot section would totally trash the rest of the engine, cause multiple disintegrations of rotating material in the compressor and hot section and fire and explosions.  Uncontained failure simply throws the failed blade out of the engine, leaving the rest of the engine intact and give the engine management system chance to shut down the now unbalanced rotating mass.

It seems to me containment is only desirable if it is the failure occurs in the hot section.  In that case the hot section is ruined already and mayhem there is unavoidable,  so then you would want to try and contain the failure as much as possible, and reduce the effect of any fire and explosion there.