Clear proof of that is the fact that UNSC Resolution 1441 was passed unanimously (even Syria voted for it).

It's at least as plausible to see that unanimous resolution as representing an attempt to hold off the Americans from attacking Iraq, so Blix and Co could continue to investigate.

The rather naive assumption being that the USA would be obliged to come back to the Security Council to get backing for an attack, if Blix's investigations threw up genuine evidence that Saddam still had the weapons he claimed to have destroyed, and that no attack would happen without such backing.