Conspiracy theories are direct responses to the official narrative being crafted as a gradient of opinion-facts that frame a political conclusion as if it's irrefutable. When rationality is abused to marginalize a viewpoint, that viewpoint shirks rationality.
Suppressing counter-sanctioned viewpoints ultimately just causes that divergence to continue growing, setting it up to pop even more drastically. If the goal is to prevent fire, the best approach is to not have fuel sitting around. If you truly want to prevent violent collapse, then work to oppose the corrupt controlling agenda that's being pushed "rationally", rather than low-effort shouting down of wacky opposition.
PS note that's all from a solely USian internal perspective. It's not really any consolation to eg the dead Iraqis that the US avoided a domestic revolution by killing them instead.
And yet the opposing simplistic narrative of "Terrorists hate our freedom" has caused orders of magnitude more harm. Hundreds of thousands of lives lost! But since that is the power-structure-approved message, it was/is heartily repeated (along side yellow cake, aluminum tubes, etc).
If someone can't grasp the bigger ideas of multiple independent actors each with their own divergent motivations, suicide attackers acting out of desperation for long term grievances, etc, I'd rather them end up at "inside job" instead of the officially sanctioned propaganda that ended up mobilizing so much death.