Ummm . . . Sweden is a neutral country.
Do you think "neutrality" is a logical national position in the war on terror?
Its my guess that although the Swedes knew this was a "bad guy", they didn't want the bad press of extraditing him to the US so they tipped off the Czechs as to his travel plans. The Czechs took it from there, being a little more stalwart about this kind of stuff.