Iraq: 63 % of the casualties were civilians

[Tellos Athenaios]

I think point (1) can be more accurately reflected as:

Bush administration (and other governments of the allies at the time) had essentially decided upon a war with Iraq and were going to get one: due process, or even a casus belli be damned. From that it should be apparent why opponents of the war consider the war so very very wrong: no need to bring in the quagmire they caused in points 2 thru 4.

EDIT: Or in one laden word that this comes so close to: treason.