Iraq Government Thinks US Is Enemy?

That seems to be a reasonable interpretation of this amnesty. This pretty much makes it clear the new Iraq government doesn't want US troops around.

Prime Minister Nouri al-Maliki on Wednesday proposed a limited amnesty to help end the Sunni Arab insurgency as part of a national reconciliation plan that he said would be released within days. The plan is likely to include pardons for those who had attacked only U.S. troops, a top adviser said [emphasis mine].