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...

USA and UK didn't liberate Iraq. Why do Iraqis fight against USA and UK troops? >>12 said it best.

If a foreign country comes and attacks your country and kills your people, would you just let them destroy what you are? The fighters are defending their country.