You're right that most smart people behave this way, but there's no guarantee that all of them will. The existential risk is still there (psychopathy is a real thing too).
But something else to consider is that so far biological super intelligence doesn't seem to get all that much smarter than what humans are at generally. If somebody is guarded against you, then it's very difficult (impossible) to fool them even if you are way smarter than they are. This could indicate that maybe there's a cap to how super intelligent AI can get as well.
But something else to consider is that so far biological super intelligence doesn't seem to get all that much smarter than what humans are at generally. If somebody is guarded against you, then it's very difficult (impossible) to fool them even if you are way smarter than they are. This could indicate that maybe there's a cap to how super intelligent AI can get as well.