I thought those re-education camps where from the south Vietnamese army traitors. And some of those where killed for sure.

There will not be a civil war in Iraq. If that's what your suggesting.
Sadr's already expelled 600 men that where accused of secterian killings. And if it does happen, that's iraq's business. No matter what will happen, the occupation must end.

Murders will be dealt with, the same way you, would deal with your murderers. The crazed soldiers returning home.