Why iraq's people kill soldiers

U.S. and U.K. release iraq's people from suppression.
But iraq's people kill soldiers of U.S. and U.K.
Why?
 
Please teach...

Hah. America is drowning in debt and the worth of it's currency is resting on the value of lead... you've sold everything to foreigners, you think you are rich because you spend, because your houses appreciate in price(not value!)... it's all fake wealth. You're depending on the kindness of strangers.