That it did not turn out as expected or as we wanted at the time does not change the justification. What I see now is a lot of rewriting of history to suit current politics, to turn Iraq into another Vietnam in reference to Ukraine. The "unanswered questions" were asked and answered then. Just like then the answers are ignored. This time the Republican side ignoring the questions and answers, not the Democrats.
Saddam was disguising and hiding his intent to restart his WMD program as soon as he could. Instead of having ready chemical weapons, he stocked up on precursors and kept up low level R&D. Bush made it easy to attack him by refusing to defend any decision he made. Why he refused to defend his decisions when it would have been easy and let the Democrats and the press to walk all over him is beyond me.
The reality is, the US and Iraqi people won. Iraq is its own country, Saddam is dead, the Baathist's are gone, Al Queda and ISIS exist as shadows of what they were, Iran is largely in check. The Middle East is not Europe or Asia. Iraq's cultural heritage goes back 10,000 years and is Islamic, not European and Christian. The outcome was never going to be neat and tidy like we think of WW-II today when Iraq's neighbors are Iran and Syria.
Dude.
You do realize that Christianity predates Islam by several centuries, right?