Still not understanding the "Blackwater problem"

It is interesting to see that the Grand Jury investigation into the Sep 16 shootings by Blackwater continues. What is equally interesting is that following the rush of knee-jerk reactions in Congress to throw legislation at the problem that ‘closed the loophole’ by including contractors to the State Department to the Military Jurisdiction Expeditionary Act, which apparently meant that all contractors would now be covered and accountable under US law. Unfortunately, having satisfied themselves that all was now right with the world, the politicians and their staffs wrenched their arms out of their sockets patting themselves on the back for a job well done….if only that were so.