Just a couple plot questions... [spoilers]

[Kedjane]

that reminds me of another plot-anomaly:

Spoiler below!

If the Turngaait can manipulate Phillips mind, why was it not able to predict/know that Phillip's intentions were to kill it. Surely, an all-knowledgeable being would be smart enough to monitor Phillip as he wrote the e-mail and prevent him from doing or saying anything destructive. Phillip claims the e-mail reached the surface, but is he that naive? Surely the Turngaait would not allow it..
Unless perhaps it did know Phillip would send the e-mail, and perhaps knew that more would come to investigate afterwards, giving it more hosts to infect....

Firstly the Tuurngait don't "manipulate" Philip, just cause hallucinations from what I remember.
As to why the Tuurngait couldn't predict Philip wouldn't tell... well, neither could I. I bet most people didn't see the "Kill them all" ending coming. People are unpredictable and after having had a pretty long chat with Philip, plus him passing all tests, I guess the Tuurngait simply relied on him. Perhaps the Tuurngait didn't know what the computer was for or what it could do (or perhaps it simply couldn't read). Unless we see a sequel I guess we will never know if the Tuurngait knew about Philips intentions or not. It is possible that he changed his mind in the very last moment aswell, making it even harder to predict.