The Usurper:First of all, your 750,000 figure is extremely inflated.  According to http://www.iraqbodycount.org/ the figure is under 100,000.

Secondly, a large percentage of these deaths are due to suicide bombers, roadside bombs, and other terrorist acts. 

I'm not saying that it's ok to kill any civilian.  And I'm not saying collateral damage "happens."  Even though it does.  But if the US went in to liberate Iraq, then killing any of their citizens, even accidently, is a very unfortunate thing and should be prevented at all costs.  But where ever you get those figures, it's wrong. 

According the Boston Globe the total figure will never accurately be known.  Even if your figure were correct, a majority of deaths come from within. 

The following is an example and can be found on Michael Moore's website: "The deadliest single incident in February was a suicide bombing carried out by a woman on February 13 among a crowd of mostly women and children on the way to a religious festival. She killed at least 38 people and wounded at least 50."

That's murder and the person or persons responsible are the terrorists and NOT the US.