They can help stabalize the country until such time as the decisions are made by a government strong enough to stand by them.
And last i heard that was what they were doing.
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But every day, there are MORE attacks, not fewer. The Iraqi troops do not want to kill fellow Iraqis, because of thje tradition of reprisals.
If they were, in fact, doing what you say, there would not be a hue and cry for a "surge".
The Iraqi government is growing more divided and therefore WEAKER by the day, they say.