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One of the real dangers of "nation-building" is the increased motivation to continue. The boundary has been breached so the inhibition is reduced.
I fear we will hear more and more of these types of arguments. They go hand in hand with the now prevalent notion among many neocons that the Iraq invasion was a good idea badly executed (everyone prefers to forget the abject failure of Afghanistan).
We have learned from our mistakes, they posit, so next time we will do it much better.
Let's ask the Roman Empire how that worked out.