Every1 saying that u hate Sai, he is a dick, he is a bastard, he is this, he is that... Cant you see, this all points to the simple fact that he is the nibi (2 tail demon) jinchuriiki ??? The emotionless demon ? Thats why he doesnt care about saying things to other people, because he doesnt feel any remorse, he nas no fuckin emotions. Now, is it his fault ? Was it gaara's fault to be doomed by the shukaku ? How about you blame the one who put the bijuu inside Sai ? Maybe it was the old fag who's trying to provoke a war, who knows. Maybe yes, he is a spy from root or whatever, but still, im sure he will change somehow and be a good person. His demon doesnt allow him to have any emotions, hence if he is told to go to kakashi team and spy on konoha he will. If hes ordered to kill a child, he probably does coz he doesnt feel any emotion or remorse deep inside. But in the end, as a jinchuriiki he will have the same fate as the other jinchuriiki's we've seen. Hes gonna learn to control his emotions and finally change, going against his demon's will. Just like gaara who had the thirst for blood and death, stoped. Just like naruto who had been alone for 12 years, worked hard against his fate and has a lot of friends. And who knows, since naruto made gaara see what was right and what was wrong, who knows if isnt naruto the one whos gonna change sai's emotions ?