“Disputes over how many Sunni Arab terrorists to grant amnesty to is
causing an increase in violence. Shia leaders believe too many of the
Sunni Arabs released from prison, or no longer subject to arrest, are
still participating in terrorist activities. Many Sunni Arabs still
believe that eventually, via coup, terrorism or revolution, the Sunni
Arabs will again rule Iraq. Many Kurds and Shia want to kill or expel all
the Sunni Arabs, and be done with the threat.”

Source:

http://www.strategypage.com/qnd/iraq/articles/20090525.aspx

Also see:

Collecting Blood Debts:

http://www.strategypage.com/qnd/iraq/articles/20090330.aspx

The violence in Iraq isn’t over by a long shot. But it’s something
the Iraqi’s will have to resolve for themselves, one way or another.