The US's reasons for the Iraq invasion doesn't matter anymore. The consequence is what matters. The US invaded Iraq and for a long time had to own Iraq. I don't think the American people want to go through that again. I think the American attitude towards war right now is similar to that of post-WWI and post-Vietnam. We're weary of war simply don't want it. I also believe the talk of rising debts wasteful spending has made a lot of Americans question what their tax dollars are paying for and if it's really our place anymore to police the world.
Personally, I think Syria should be a UN concern, an international one. I think the days of the world relying on America to clean up everyone's mess is slowly coming to an end.
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