I remember having very mixed feelings. I felt Afghanistan was in some sense justified, though perhaps a Very Bad Idea. (The whole, "Afghanistan breaks empires" history lesson.) For Iraq, I thought they probably did have a WMD program, but still thought it was a Very Bad Idea.
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I didn't really do any marching, though. And in retrospect I had too much faith in the idea that however bad the Bush admin was on these things (and I suspected they were pretty bad), they wouldn't be as bad as they turned out to be (e.g., no WMDs, no long-term plan, etc.).
The fact that things were bungled MUCH worse than was in my imagination to perceive at the time has definitely impacted my judgment of the wiseness of US interventions abroad since then — I now tend to err on the side of thinking things are NOT going to go as planned, at all.
