If you can read French (sorry, Freedom), I think this article from Le Monde is a good and simple analysing summary of "why".
I keep hearing people say that 45 countries support the US while only 6 oppose the war. This shows some high level of indoctrination, likely with some major media manipulating information. Le Monde published a map of the world with countries pro and countries against (which is what I was looking for online but apparently it is only in print), and without couting it's quite clear that part of Europe + Russia + China + the entirety of Africa (minus Ethiopia (pro), Rwanda (neutral), and Somalia (no official government)) + India + most of the Americas (minus the USA, Bolivia, and one or two small countries) adds up to much more than 6. But then CNN sees shuttles travelling at multiples of the speed of light and has experts smart enough to know that Ossama is "either dead or alive" so I wouldn't be surprised if simple arithmetics were well beyond them.