Unseen, Well, it’s not just mean words you would have to look for to determine the violence in the book. You would also have to actually read the passages for meaning and read them in context of other text and actual events documented elsewhere to get the full depth of their violent content.
For example, this passage in Revelation 22:18-19 has no mean words, but still portrays a mass genocidal culling of humanity:
18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book.
19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.
Pretty stong meat there from JHVH-1. Even stronger when you read the plagues in the book and understand that Revelation is JHVH-1 destroying the world again with fire after having first destroyed it with flood thousands of years earlier. And Revelation is even more frightening because it is supposedly in the future and hasn’t happened yet.
Also, The Qu’ran is filled with variants of “And The Fire awaits the unbelievers” which technically have no mean words in isolation, but which clearly intend eternal divine violence from Allah. Also, because The Qu’ran is written in Arabic, you would have to read it from back to front to get a better grip on it’s horrors.
And the Hindus believe in eternal cycles of birth, death, and rebirth, so so untold misery awaits you there I’m sure.
With all this in mind, all of the texts listed are all probably even more violent than the study suggests. Hate to be the punch-bowl pisser, but they left us with this mess.