He probably considered that the Spanish were trying to impose their power through putting across such behavior and that it was essential for him to employ a similar attitude by throwing the letter. The Spaniards themselves failed to comprehend the ritual that they were taking part in and thus only managed to infuriate their host as a consequence of thinking that the 'chicha' was similar to any other drink (Yupangui & Julien 11). The fact that the Andean culture was poorly organized made it difficult for Andeans to understand the attitudes that they needed to employ concerning foreigners and local affairs. They thus had the tendency to support any one who was strong enough to become king, regardless of the fact that the respective person was not necessarily worthy of this position. Titu wants to emphasize that the cultural clash between the Andean society and the Spanish one marked the beginning of a different era for the Inca Empire, taking into account that both communities had trouble understanding the other and that they eventually came to influence each-other.

Titu constantly refers to the Spaniards as being similar to what Andeans perceived as being Virachochas because his people had never come across a group that was so different from them. As a consequence, the only thing that he and his people could associate these people with was gods coming from another world. Atahuala himself was aware that many of his supporters would not come in his aid because they considered that the Spaniards had supernatural powers and that it would have been pointless for them to try and defeat them. The fact that each Spanish...

Both Atahuala and Pizarro wanted to rule over the area and to exploit all of its resources, regardless of the fact that they came from different backgrounds. The Spanish were more 'modern' in character because they considered material values to be much more important than cultural values. This is one of the principal reasons for which Atahuala's Spanish visitors failed to understand that he provided them with a privileged opportunity to drink a beverage that was considered special in the Inca Empire. The two communities came to clash because there was a failure to communicate and because people like Titu Cusi were the only ones who understood that diplomacy was very important in order for them to coexist peacefully. The fact that he did not hesitate to convert to Christianity actually proves this, considered that this act was most probably meant to guarantee that the Spanish would refrain from wanting to exploit his people further. In addition to discussing the Andean defeat, Titu Cusi also wanted his readers to learn more about culture clashes and about how the Andean community suffered even before the Spanish arrived in the area.
Works cited:

Diego de Castro Yupangui (titu cussi), Catherine J. Julien, "History of How the Spaniards Arrived in Peru," (Hackett Publishing, 2006 )