ASDF, you are taking the "but…for" argument to extremes. CASA is not liable for all aviation outcomes.
CASA is there to ensure that the respective systems within aviation organisations ensure that there are not bad outcomes.
This is why the harassment of Dominic James was such a travesty of justice. CASA should have focussed on exactly why James encountered the situation he found himself in in the first place….that line of enquiry found multiple systemic failures in James employer organisation, Airservices and Met.
However it was too hard politically to go after those organisations, so James became the scapegoat.
CASa need to be asking themselves how the heck could a maintenance organisation think that undersize bolts and a time expired tie rod be good enough for an aerobatic aircraft being used to the limits of its performance?
By the way, I predict that the CASA response to this report will be the banning of aerobatic joy flights in Tiger Moths.