Well actually because Europe is not a unit. When europe wasn't interested in invading Iraq, it wasn't europe at all. It was each individual country in europe that wasn't interested, apart from the UK and Spain.
Spain's president was more or less bought and promised aid to Bush even before the subject was passed in parlement (it never did). He was thrown out by a large majority the next election.
My personal opinion is that the UK wasn't to eager either, but took Bush's side to act as a bridge between both sides of the atlantic (symbolic isn't it). If you hear Blair's lame excuses to join the US you might agree. Also Blair never got a real hard time from the rest of Europe.
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