Why Should They Care?
Of course they went ahead with the launch as scheduled -- because HHS has nothing at risk. Maybe a head or two would roll, but probably not. It's not their data, they don't have to show a profit, they don't have to keep customers happy.
It's just a huge recipe for (yet another) big government failure.
Of course, the hacker risk to your data is nothing compared to the political risk of your data being in the hands of the IRS.