Self-importance

Tom's full of his own self-importance.

The pompous professor was full of his own self-importance.

The people most likely to embrace conspiracy theories are less inquisitive and often exhibit narcissistic tendencies, such as an inflated sense of self-importance, a deep need for attention and admiration, troubled relationships, a lack of empathy for others and fragile self-esteem.

Narcissistic people have an exaggerated sense of self-importance.

You're sounding like you're bloating out your own self-importance.

Lord Marchmont was about thirty years of age, and what is generally called a fine-looking man. His figure was good, as far as his height and proportion went; but his movements wanted ease, and, consequently, grace; and there was something of self-importance in his air—the last thing in the world to prepossess a beholder in his favour.

Wikileaks has always had a healthy sense of self-importance—one that seems, at least in part, well-deserved. But there's something uniquely hubristic about accusing a major newspaper (and former collaborator) of "gross negligence or malice" over the release of 251,000 unredacted top-secret cables—when the fault lies with the website itself.