The Iraq war was nothing if not an armed militant movement shifting power from one class to another! Violence was justified in South Africa but not in Iraq?

That "armed militant movement" in Iraq was comprised of foreign invaders, not Iraqi citizens in revolt. No power has shifted yet, but a vacuum was created and is being temporarily filled by those same invading forces - and a damn fine job they're doing, as ones and twos and tens of them are picked off daily.

Violence was justified in Iraq because the US government said so.

Violence was resorted to by both sides in South Africa.

June 16, 1976 - It began with a peaceful demonstration by several thousand students, ostensibly against Afrikaans, and ended in a bloodbath well documented. A holocaust of teargas, raging fire, bullets, children wounded and dying, along with other innocents caught up in the rate. Conflicting stories are told about the beginning of the violence.

Eye witnesses contend the violence began upon police intervention - trying to stop the march. The children taunted the police who retaliated with teargas. Stones were thrown - shots were then fired but whether stones came before shots or shots before stones is a point of contention. [...]

We have seen police shoot at children many times. Defenseless thirteen year olds. Firing on the students solved nothing. The Government could have avoided the whole tragedy if they had heeded the call several months before the riots. Students would have been appeased by a statement that Bantu Education was to be scrapped. Afrikaans in particular but the government refused and stubbornly clung to outdated ideas. If the police had kept out after that first day the violence would have stopped.

A History of Soweto from The Knowledge Network.

The systematic, often violent oppression of the majority of South Africans by the tyrrany of apartheid bears a close resemblance to Saddam Hussein's treatment of his own people, and the treatment of Pelestinians by certain Israeli governments (especially those which have included Ariel Sharon as a minister). If the Iraqi people had risen in rebellion, it would have been justified? But not in South Africa or Palestine?
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You may not find justification for violent revolution to overthrow tyrrany in the words that follow, but considering the upcoming comemmoration, I suggest you read them a few times befoe resuming your ill-informed, prejudged, knee-jerk condemnations (which you will do, regardless - to that, one must be resigned):

That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness. Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security

In Congress Assembled, July 4, 1776: The Declaration of Independence