Well... I am not too sure about shooting rockets at civilians, but don't conveniently forget how many military trials have taken place against the yank soldiers who have treated POW's in a inhuman and unacceptable fashion.
The Bush govt went on their own accord to Iraq. The UN offered no support and condemed such actions. If Iraq was such a screwed up place why would the UN refuse to help? The fact of the matter is that USA only invaded Iraq to benefit themselves in the form of cheaper oil (simplified version of the whole story).
Yet this has backfired, and crude oil has not dropped in price. Yes, I know that other factors of play do come into this equation, so no need to point this out.
Anyhow, all in all the large proportion of the American public was not informed in full as to why they had to "liberate" Iraq. With that said though, this may be a good thing. At the risk of generalising, a great deal of Americans are not the sharpest tool in the shed.
Example:
http://media.putfile.com/On-The-Streets-Of-America-3