1) Some government agency builds massive computer system containing lots of information about the general public.
2) There are numerous obvious holes in the "massive" computer system for obvious reasons (government's haste, lack of oversight, etc).
3) The government's computers get hacked.
In my opinion, numbers two and three are inevitable when number one takes place.
Something similar just happened in Canada a few years ago with all of our driving information: http://www.huffingtonpost.ca/2012/11/06/service-ontario-kios...