That's more true for conceited or narcissistic intelligent people.

The form of a conspiracy theory is "reality is simple enough for you to understand. The reason you don't understand it is because THEY want to obfuscate reality for personal gain"

If you're just humble enough to understand that no one can understand the world no matter how smart they are. That lack of knowledge explains a lot more than malice. Then you're going to be mostly immunised against conspiracy theories.