It ended the suffering. It's the right thing to do in such case.
What puzzles me more is, what kind of a cheap crook is that guy that wrote the book?
Making not enough money as navy seal? Greedy ass douche bag, that's what I call it.
On one hand, he doesn't want to have the book used for political purpose, on the other hand he writes a book that has everything to do with politics.
He's a disgrace for every righteous soldier, in any army, not just his own.
I mean, we are talking about a position in the military that leaves even the spouses of those soldiers in the dark. They aren't allowed to tell their wives, parents, or siblings what they are doing, and he writes a book to tell the whole world?
Imho, he deserves severe punishment by the Pentagon. Strip him of every single dime the book makes, and dishonorable discharge him.