Yes, but that is not a valid reason to justify the war because an autonomous Kurdish zone had already been set up after the Anfal in 1992. The only way Iraqi troops got in there is when the KDP invited them in during the Kurdish Civil War from 1994-7. Then once that was mediated and the KRG was split into two the Iraqi Army was no longer allowed in. The only real change 2003 brought was the legalising and formal institutionalisation of the KRG such that foreign capital was more willing to invest in it (encouraged, in fact, as the US tried to rebuild Iraq to stabilise things) and it had a big shiny "legal" sticker on it. The realities on the ground didn't change though, especially as the constitutional articles surrounding referendums on Kirkuk and other disputed areas never came to fruition.

So by 2003 the Kurdish Question in Iraq had not been solved, but it had certainly been pacified in intensity, because a de facto independent KRG already existed!

I get what you're saying, though. Yes, Saddam was an abhorrent and awful leader who was a genocidaire. However, the war was still an illegal catastrophe based on falsehoods that made things drastically worse for the Iraqi people. It is unjustifiable even when you take Saddam's terrible-ness into account.