I’m not sure what you’re arguing for. If we had ignored everyone claiming there were WMDs then a million people would still be alive, not to mention the trillions of dollars saved.
they did learn from their mistakes.
they learned that there's zero consequence in trafficking the right lies for the right people and were professionally rewarded for doing so. it should be no surprise that the exact same people latched so heavily onto the steele dossier and the cult of mueller-ism