Absurd. Nobody is "relaxed" about an incident such as this.
There will be an enquiry by the AAIB. The results will be published and in the public domain. You will be able to read them. You will them make a decision as to when and if you choose to fly with this airline in the future as a result. While you are waiting for the results of the investigation to be published you may while away the time by reading other AAIB reports about other incidents affecting this and other airlines and make similar decisions. Your 'confidence' will be raised or lowered accordingly.
The OP's original point was about the maintenance and repair of the aircraft: Discussions about whether or not your confidence in the 'flying skills' of the crew involved should be maintained are off-topic and pointless, as are hand-wringing proclamations about "how best we prevent".
Back on topic please