Strategic history can only be looked at as "history". Strategy can only be viewed by how it implemented the policy at the time - as it was executed.

Was the policy of getting rid of Saddam a blunder? Personally I believe not.
Personally, I think how the US invaded Iraq was done extremely badly - if the policy was to have stable, pro-US nation. That was the Strategic blunder.
It was so bad, that it is an example I use to show how people do not understand how strategy sets forth policy. Would an alternative have even worked? Dunno, but I almost any clown can show how strategy could have been bettered linked to policy.

Was Iraq worth 4,000+ KIA it cost? Dunno. What level of Iraqi support for the US - for how long - makes that all worth it? Dunno. - but strategy costs. Lives or treasure. It never comes free.

Not sure this helps, but it's free.