To paraphrase Sigmund Freud:
A man loans his neighbor a kettle. When the neighbor returns it, the man notices that it is damaged. The man demands restitution. The neighbor replies: “The kettle is not damaged. And besides, it was damaged when I borrowed it. Furthermore, I never borrowed it in the first place.”
This is how denial works in the classic conception, scattershot and shamelessly contradictory. The point is not to make a rational case but rather to overwhelm anyone who would try to reason with you. This technique works as well as it does because false narratives are far easier to create than to debunk. Or to borrow a phrase from Mark Twain:
A lie can travel half way around the world while the truth is putting on its shoes.