Some quick notes...
The WTC towers didn't fall from the top or the bottom - they both fell from the middle, roughly where the planes hit. The burning jet fuel liquefied the steel supports in the walls, a few floors collapsed, and the shock of that impact made the whole thing collapse in both cases.
As for the US government staying out of other countries' business for a month, sure there'd be people whining for them to come back...
...US-installed puppet dictators suddenly finding themselves with no support, since their military and/or police now have no funding or weapons, and the common people who despise them have no method of control...
...US-based multinational corporations who control government officials with hefty bribes while the actual people of the nation see their rivers poisoned, their forests razed,, and their air filled with smog...
...the World Bank and IMF, they'd be sad to see US financing and military muscle go from the world...
...that said, I doubt that regular everyday Nigerians, Argentinians, Afghans, or countless others would be too sad about it.
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