I think the primary reason there is no accountability is because there are too many who don't want someone like Neary turning state's evidence in order to lessen their own bill.
I still think a system of 'plea bargaining' would do far more to clean up corruption in Ireland than any general election with a reform mandate.
It would do away with the need for tribunals for a start.
As for "finding out what happened", the books, oodles of them, have already been written. Any enquiry, review or investigation will just officially tell what is already abundantly clear.