I don’t think there is such a thing. Aside from obviously credible things like “the CIA did X thing Y years ago”, conspiracy theories are generally not harmlessly even if they’re the flat earth kind.

I’ve seen interviews of flat earthers who say their family has cut them off because of their conspiracies. It can become such a huge part of them, that they can’t help but push it on their friends and families. It drives them crazy, so they cut off said conspiracy theorist from their lives.

And there is also the part that belief in conspiracy theories lowers your standard for evidence, makes you paranoid and stubborn, all of which makes you prone to other conspiracy theories.

I’ve seen much of this with my own mom. She first started believing the covid vaccines were bad, now she believes Bill Gates & George Soros are trying to depopulate the earth. And nowadays it has lead to her acting like fluoridated water and toothpaste is cyanide. Once you have your foot in the door, every other more dangerous conspiracy theory becomes more palatable.