Amongst other reasons, I chose to publish the book through LeanPub precisely so that if anyone every feels like they regret buying the book, there is an avenue

Amongst other reasons, I chose to publish the book through LeanPub precisely so that if anyone every feels like they regret buying the book, there is an avenue for them to get a no-questions-asked refund. Check the web site for the specific terms. You don't have to justify anything to me or anyone else: If you personally feel uncomfortable, I personally want you to get your money back. You can always change your mind and buy it again if that's what you want to do.