The publicly stated reasons for going to war, and the actual reasons, are different, though obviously related.
Regular citizens generally are not going to buy into complicated arguments or vague, geostrategic issues, they often need clear, more unambiguous line of reasoning. Especially those that align with their supposed values.
The proles need to hear stories about 'Freedom' and 'Democracy' and 'Evil Tyrants' and scary things about 'Masses of Chemical Weapons'.
US leadership wanted to enter WW2 long before the American public could be convinced. It took an attack on American soil, and dead Americans to tilt public opinion.
The US used a 'False Flag' (Gulf of Tonkin) operation in Vietnam to help build public support and credibility for intervention in Vietnam.
George Bush proposed a 'False Flag' UN airplane incident apparently, an idea that was quashed.
This is the case in every war, without getting too controversial, even the US revolutionary war.
It all seems kind of Machiavellian and duplicitous, and it is, but it's also the reality of leadership in ugly scenarios. Imagine that you're the leader of a nation that really, really needs to do something that the plebes don't want to do? It's a weird kind of moral dilemma.
FYI I'm not justifying any of these decisions, just illustrating the incongruity between actual planning, and the marketing / communicating of it.
COVID is an example of that, it's a massive exercise in 'Public Communications' where the stakes are existential. What we are being told publicly i.e. the 'Narrative' isn't a lie by any means, but it's definitely designed to create outcomes.
So:
" The reasons we went to war were very clear, 'Saddam was stockpiling WMDs and was a threat to world.'. "
No, that's just what they said publicly. That's how war was 'marketed'.
Also - they used the term 'Terrorism' a lot with respect to Saddam, i.e. 'War On Terror'. Of course, Saddam was definitely not a radical religious terrorist, he was basically the opposite of that.
Everyone pushing for the war knew that the material evidence for WMD's was pretty weak.
PNAC made several publications before Bush came to power, and the public members of PNAC literally filled the White House.
Those who were against (or more Dovish) on the war i.e. Colin Powell and Condi Rice - were the not part of PNAC.
So imagine if there was this 'Think Tank X' that wanted to push for some thing, 'X' and then when Biden comes to power, more than 1/2 of his Cabinet is literally from this special 'Think Tank X' and then after 1 year, the all push hard for this 'X thing' but communicate it to the public as 'Y'?
You can hardly say it's about 'Y'.
It's about 'X', it's fairly clear.
There were 17 members of PNAC in the White House. And the President's own Brother.
[1] https://gyaanipedia.fandom.com/wiki/List_of_PNAC_Members_ass...