If this were true, then why indeed would it be incumbent [as it appears to be judging by world opinion] on the US and its allies to guarantee the safety of Iraqi civilians?
The responsibility for the safety of Iraqi citizens should be in the hands of the Iraqi government. That it isn't--that indeed the Iraqi government has taken active steps to endanger its own people--destroys any claim to legitimacy it may ever have had.
Politics makes for strange bedfellows. The "internationalists" position seems to be that "international law" should support this kind of lawlessness.
A perversion of the mind and of the English language.