Lonesome Dove - spoiled in preface!!!

I'm a hardcore Scfi/Fantasy guy. However, now and then I venture out from my cave to read real literature. Recently one of the booktubers I watch mentioned that Lonesome Dove is one of the great novels of the 20th century. Amazon confirms 4.8 with almost 20k reviews. So I download the sample.

I like reading preface's, introductions, author's notes, etc. They often provide context for the upcoming novel. However, for some messed up reason, the author completely spoils endings of seemingly important characters at the end of the preface!

For those that have read the book, McMurtry mentions that Newt is never acknowledged by his father and then gets killed by Hell Bitch (what a great name for a stallion!)

Unfortunately, this has put me off the book entirely.

I'm honestly not sure what the point of this post even is. I'm just annoyed and frustrated at the author and felt like venting somewhere.