I'd like to know how many writes it did since this would finally settle the issue of whether FBI / NSA can read erased data. If one write is good enough for them, you know they can't recover anything with one write either.
In all likelihood, all the Flame authors are trying to do is prevent computer owners from casually detecting that they were infected, now that Flame is public knowledge.
Knowing specfically what the virus was looking for, which machines were infected, and what data was snarfed is of critical importance to the targets.
Purging makes the targets job of forensics much much harder.
Edit: flame code is not monolithic - forensics would be very interested in getting code for all modules: "Later, the operators can choose to upload further modules, which expand Flame’s functionality. There are about 20 modules in total and the purpose of most of them is still being investigated." - http://www.richardsilverstein.com/tikun_olam/2012/05/28/flam...
Second, my source has extensive Israeli military, political & intelligence experience. Third, almost all his scoops have turned out to be true. None have been proven false. Now, what are your bona fides & do they match his?