Killer Roads, Killer Drivers or an Incompetent CVLB?

We are now witnessing the usual hand-wringing exercise of the authorities after the horrific crash that killed 12 people along the North-South Highway.
This is not the first case involving express buses and usually after a few weeks of noise, everything returns back to "business as usual".
Even now the association of bus companies is trying to deflect blame on inadequate guard rails as reported in this article.
Thus far I have read of thorough checks being done on the bus brake and steering system and the tyres and also checking the "black box".
I wonder if they will check the health records of the bus driver- did he suffer a heart attack or other health problem before the accident?
Why is the black box being checked only after a tragic accident? I thought these data recorders are most useful as a management tool to haul up errant drivers.
What is the record of the company in using this important tool?
I also watch the incredulous interview by an official CVLB stating that new express bus licences are being suspended to enable them to keep better control of existing bus companies. I suggest that this incident shows the CVLB is incompetent to even look after the existing bus companies.
Maybe having too few companies prevents the CVLB from suspending errant companies as the public has no other alternative if the only express bus on a particular route is suspended.