Why would the invasion at that time take place if no one believed that particular state had anything to do with or were preparing for attacks on other states? I don't know anyone that goes around attacking cupboards because it is possible despite being unlikely that they are hiding bogey men. I'd hazard you have no evidence that the invasion would have occurred had the list not been believed. Am I wrong?
We have evidence that heads of states (ours) kept trumpeting lies after they had been made aware of were lies to their citizens to eventually invade a state that had nothing to do with the initial cause of fear. That isn't even bringing in the argument that the story changed as their lies were exposed to give new reasons why we of the coalition 'should' attack a state that had no evidence for external maliciousness except to be uncooperative. Other states similarly uncooperative have not been invaded despite showing a greater propensity to external aggression.
Was Iraq failing to meet its international requirements wrt weapons? Yes. Was that sufficient provocation to invade? I don't believe so, but I'm willing to listen to arguments for it. So far I've only seen irrational myopic xenophobic arguments, but I'll listen for an actual argument.
Regardless, I believe the topic is about vaccines and differences of opinions of their effectiveness? I haven't seen a rational argument against vaccines either, but I'm glad to be proven wrong.