Alright, lets see here. America created bin Laden and Al Queda, you trained and armed them. Then, you supported (and still support) the regime in Saudi Arabia with the bin Laden family getting huge amounts of business coming their way. So, in a way, you're also supporting him financially.
Now, Osama hits your towers, and suddenly he's everyone's enemy? What he wants is US troops out of the Middle East. So do I. Why should I fight your enemy when I agree with his ends, if not necessarily him means. You can talk all you want, but I believe hes not out to kill or convert all Christians blablabla. He wants US troops out, thats not unreasonable. Now, he's offering Europe (too broad, but whatever) a truce. Alright, Serbia is part of Europe. He has never harmed, nor does he intend to harm say, France. Why should they put their citizens at risk for going after your enemy?
As I see it, bin Laden is America's problem. He is not a threat, not even a potential one, to most of Europe. Why shouldn't they accept the truce? The only attacks he has commited were against Americans, and he had a damn good reason for doing it. Now, before the whole lot of you start jumping up and down and yelling "terrorist lover", I'de just like to inform you that I think Osama is a fundamentalist asshole and ought to be shot. But, its not my fight, and I agree with reasons for fighting. Its retaliation for the heavy US presence in the MIddle East. Lets call it the invasion of the MIddle East. Same as in Iraq, an invaded people have a right to hit back.