Well, i can see this you are trying to blame the war of Iraq to America and hence blame the war casualty to America, but dude, you have plot of your thinking.
A.) How do you know the WMD is a lie? Do you know personally there are no WMD in Iraq?
According to this Article, The britain will help destroying the "REMAIN" of Chemical weapon in Iraq, the article dated 30 July 2012
UK experts to help Iraq destroy chemical residues - Yahoo! News
There are at least 2 bunker of Chemical Weapon left on Northern Iraq even at the end of the Iraqi war, unless you don't count Chemical Weapon WMD........
Now, i don't know if you actually innocently or you intent to misrepresent the truth behind the war in Iraq. But the war in Iraq was NOT because there are no WMD, rather the Iraqi hestitantly to destroy the WMD.
The actual start of war is like this
Before America invasion, there are no "Stockpile" of WMD as the west suggested but there are occasion stash somewhere in smaller quantity, the big stash the American Hope for is long gone, according to the Reliable source, they were destroy but there are some who believe they were transferred to Iran, no proof were ever given to this, so i can only say it's rumor.
The problem with Iraqi government is, they claim they need months if not year to dispose of those "
REMAINING CHEMICAL WEAPON" but the west think they are an interpretation of stalling thus allow time to move around the Ghost stash (The stockpile the west hope for) and hence violating the UN Resolution 1441, which demanded Saddam give "
immediate, unconditional and active cooperation
The core of war is the West believe that a large quantity of WMD still exist in Iraq, and there are "
reliable" intel that suggested that the Iraqi is buying time to move their WMD, but the truth is unknown, as the only witness said the Intel is legit turns out farbicating the evidence. However, the issue of why the Iraqi take so long to get rid of the "Remaining" Chemical weapon is also unknown.
The issue is, yes, the United States have responsibility on the Iraqi War, but so does the Iraqi government, known Chemical Warfare site were recorded and notified but they somehow refused to destory them under the UN resolution 1441.
B.) You cannot demand the responsibility even for the country that started war. Let's say you are correct, the US started the whole war for Iraqi resource, you really cannot blame the American the death of civilian. Do you even know how those civilian are killed? According to AP, about 20% of those are killed by IED planted by the insurgent, 46% but secular murder, only about 6% by Colition accident.
You cannot claim all the civilian death are the work of the American Colition since not all of them are war death, and you need to know, with or without America and Iraq war, Iraq is a violent place for its secular violent, you do know the Iraqi Sunni and Shia don't like each other and have been fighting in Iraq for more than 500 years, right?
I cannot stop you from blaming america but do your research right before you do.