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...

We knew they had wmd, what we didnt know was they got rid of it somehow. If the wmd threat wasnt real, it was well invented since most everyone believed in it.
Not to mention alot of people in high places wanted saddam gone for many reasons. If you dont believe wmd then choose another one. oil for food, genocide, threatening his neighbors, nuclear aspirations, being a 1st class dick, pick whichever you want.
One wasnt real? whoops...

I dont think the UN can justify its lack of action because a US lead war didnt turn out 100% ideally. Few wars are started for as good a reason or come to a conclusion as smoothly.