Sagat seems to serve Bison only as like a bodyguard. His only goal is to get revenge on Ryu, and that gets tempered down to a mere desire to have a true battle with him. He doesn't have any evil ambitions or anything, and I believe the only thing he does canonically that can even remotely be considered evil is killing Dan's father, which seemed to just be a street fight that got out of hand after Dan's father irreparably damaged his eye.
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SuperNiceDog was here...
7Deuce is a loser