I don't get it. IF and just to make it really clear IF this guy private hired the aircraft, went away for a couple of days what do you expect the instructor or school to do?
If you have any experience at all you would know just because Bankstown was crap and even the forescaste wasn't good, does not mean the actual weather is not suitable, especially 100+ miles away. Once you hire an aircraft you rely on the hirer to make appropriate decisions.
Now if he was signed out to do a solo nav in crap weather then yes, crucify the school, the instructor the lot, but I certainly haven't seen that info anywhere here or in the media.