There were and are so many dumb and incorrect conspiracy theories that I think it's understandable that people would outright dismiss them, even if there was a real conspiracy.
Take the deep state. Sure, you can say that there absolutely is a deep state of oligarchs influencing/controlling governments. But if you read about that topic on conspiracy forums, you'll quickly find it getting entangled in bullshit like Pizzagate or QAnon. They said Donald Trump would be the one to finally "expose the deep state", which is just laughable. On the same forums you'll find stuff like "flat earth". So why would anyone use those places as sources of trustworthy information?