Such as?
you wrote: "such as?"
I have no idea...I could theorize, but it would be just that, theory.
The real travesty here is that Joe Citizen really does not know. In a republic, war is carefully debated by free citizens who weigh the arguments pro and con. If war is chosen, everyone knows the reasons, because the grievances of the citizens ARE the underlying motive for the war.
An empire functions in a totally different manner. In an empire, you have a polyglot population presided over by a deracinated, cosmopolitan elite. There is no commonly agreed upon motive for war because there are no commonly agreed upon interests and beliefs.
Thus, war usually results from the arcane manipulations of various influential pressure groups. In this setting, Joe Citizen is unaware why his son is dying and why his house just got blown up. He may have heard the offician line, but he is usually smart enough to realize that the official line is bunk. As to what the real motives are, Joe Citizen can only speculate.
I do not believe that WMD were the real reason for this war. The evidence presented was off-the-cuff and somewhat amateurish. The reality of 6 weeks of occupation is that none have been found. We were told that the country was awash in tons of toxins and gases.
As for the other reasons, they are equally suspect. The connection to Osama was always tenuous at best. The fact that Hussein is a dictator was also somewhat phoney, since this didn't stop us from arming him in the 80's (and it doesn't stop us from allying ourselves with other regimes such as Pakistan and Saudi Arabia...both of which have more connections to Osama than Iraq did).
So....the bottom line is this: We went to war. I am unsure why. But I do know that the stated reasons are bogus. Past that, you'll have to ask someone who is privy to what is going on behind that imperial curtain.