You are right in pointing out the sinister count of 66 books in protestant canon.

But... How did you arrive at 72 books in the Catholic bible? Pretty easy to confirm that there are 73.

Once the canon was determined, and until the protestant revolution, all of Christianity had the following 7 books, in addition to the 66 the protestants claim:

Tobit, Judith, 1 Maccabees, 2 Maccabees, Wisdom of Solomon (Also known simply as “Wisdom”), Sirach (Also known as “The Wisdom of Sirach” or sometimes “Ecclesiasticus”), Baruch

Good 14 minute explanation by Jimmy Akin: https://www.youtube.com/watch?v=GKdI-kFbg3Y

You are right in pointing out the sinister count of 66 books in protestant canon.

But... How did you arrive at 72 books in the Catholic bible? Pretty easy to confirm that there are 73.

Until the protestant revolution, all of Christianity had the following 7 books, in addition to the 66 the protestants claim:

Tobit, Judith, 1 Maccabees, 2 Maccabees, Wisdom of Solomon (Also known simply as “Wisdom”), Sirach (Also known as “The Wisdom of Sirach” or sometimes “Ecclesiasticus”), Baruch

Good 14 minute explanation by Jimmy Akin: https://www.youtube.com/watch?v=GKdI-kFbg3Y