"because the author can write the book however they want"
Side note:
"Talking about: chronological written in the order that events occur in real time flashback a change in the storytelling order where the current action flashes back to the past flash forward a change in the storytelling order where the current action flashes to the future"
Quoted answers are NOT Mine. I take NO credit/responsibility for this answer.
In the last paragraph, you want to make sure you emphasize your point, as its the last thing the reader is going to remember from it. You may also want to include your own opinion if it is necssary.