Answer:
you might want to italicize the questions, like <em>why do so many people follow conspiracy theories </em>and <em>what makes a conspiracy believable?</em>
Explanation:
The word would be extrinsic. Extrinsic means "<span>not part of the essential nature of someone or something; coming or operating from outside."</span>
To really beautifully portray the emotion of the story/meaning that he is telling.