Here's a short story:

Chapter 16: A Treasure Room. 

"'Tis infamous," Cacama said, as he paced up and down the room; "but what is to be done? They hold him in their hands as a hostage, in the heart of his own capital, and among his own people; and are capable of hanging him from the walls, should a hostile movement be made against them. 

"You were right, Roger Hawkshaw, in warning us against these men. They are without faith and honor, thus to seize a host who has loaded them with presents, who has emptied his treasuries to appease their greed, and who has treated them with the most extraordinary condescension. It is a crime unheard of, an act of base ingratitude, without a parallel. What is to be done?" 

Roger was silent. Such a situation, so strange and unlooked for, confounded him. 

"I should say," Cuitcatl burst out passionately, "that every Mexican should take up arms, and annihilate this handful of invaders. What though Montezuma fall? Better that a monarch should perish than a nation. Besides, Montezuma has shown himself unfit to govern. It is his weakness that has brought things to this pass. Think you that the white men could ever have advanced beyond the plateau of Tlascala, had all the forces of Mexico barred the way? Think you that they could ever have entered the capital, had it been defended with resolution? One moment he flattered the strangers and loaded them with gifts; the next he was ready to send his forces against them. The Cholulans had good reason for believing that he designed the annihilation of the Whites, if he did not actually order the attack upon them.  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Who is the hostage?
Guess: unknown

Question: Where is he being held?
Guess: In the heart of his own capital.

Question: Who is holding him?
Guess: Invaders.

Question: What do they plan to do with him?
Guess: Hang him from the walls.

Question: Who is not fit to rule?
Guess: Montezuma.

Question: Why is he not fit?
Guess: He is weak.

Question: What's an example of his weakness?
Guess: Because he didn't send forces out to stop the invaders early on.

Question: What did the Cholulans think of him?
Guess: They believed that he designed the annihilation of the Whites

Question: Was he consistent in his treatment of outsiders?
Guess: No.

Question: How so?
Guess: One moment he flattered the strangers and loaded them with gifts; the next he was ready to send his forces against them.

Question: What does Roger think of this?
Guess: He doesn't approve.

Now answer the following question in the same format.

Question: Who is guilt of lack of thankfulness?

The Choulans.