I am trying to decide if I want to purchase Mary Trump’s bombshell book about her uncle, the current president of the United States.

She doesn’t need my money to make the fortune she already has earned by early sales of “Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man.” I hear she’s sold nearly a million copies of her book.

But there’s another reason why I might not read the book from cover to cover. From what she has said so far in TV interviews, there’s nothing she has revealed about Uncle Donald that I don’t already believe.

I believe he is the “virulent racist” Mary Trump says he is. I believe the assertions she has made about his use of the N-word and the anti-Semitic slurs he has uttered. I also actually believe that young Donald got someone else to take the Scholastic Aptitude Test he needed to enroll at the University of Pennsylvania.

I believe Donald Trump is as vile, venal and vengeful as Mary Trump reportedly portrays.

She won’t change my mind one little bit about this individual.

So, it falls on me to decide whether I want to spend money on a book that likely won’t tell me anything I don’t already believe.

Mary Trump is no interloper. Her father, Donald Trump’s brother, died of alcohol abuse. She has no relationship with Uncle Donald. Still, she is highly educated, earning multiple degrees and carving out a career as a clinical psychologist.

She seems credible to me.

I am left to wonder whether it also will ring true to those who keep giving Uncle Donald a pass on the conduct in which he engaged for his entire adult life.