I agree. It is a bit of banter when ppl look at your Cersei Lannisters and say they're so smart for pathologically stabbing their allies in the back for immediate gratification when the ability to cooperate, trust and work towards the future is a basic element of being a functioning adult human. Like if you compare a chimpanzee to a human infant, in terms of IQ they are similar in what kind of puzzles they may solve on their own. Yet when it comes to solving puzzles that can only be solved through cooperation, human infants who have never met one another nor speak a language, are able to work together to solve the puzzle.
Machiavelli cautions that the basis of power is stable relationships, trust and consistency. Let everyone know where you stand, and that you will be predictable, strong and fair. Then you will create an environment where people are much less likely to try and murder you, whilst your allies will know you are someone who had their back when they needed you, and they'll have your back should the day come you need them. Likewise, to not trust in those of mercenary character, because they are people who are unable to put the interests of a greater group ahead of immediate, impulsive self-profiting.
There's a neat little research project someone did ages ago where they modelled a bunch of evolutionary strategies. On a big grid, each cell represented a living unit, and when that unit encountered another it could choose to cooperate and they would both get food, or it could choose to steal and get all the food. If a unit went too long without food, it would starve and die. If it got enough food, it would reproduce and make another unit.
The strategies:
The Traitor - The Traitor was a strategy whereby they would only cooperate with units it didn't recognise, and would refuse to cooperate with units it did recognise.
The Selfish - The Selfish unit would refuse to cooperate with anyone at all.
The Pathological Altruist - The Pathological Altrust would cooperate with absolutely everyone.
The Tribalist - The Tribalist would only cooperate with those it recognised.
The Selfish and Traitor units proved resilient, though they never attained dominance, because they are both self-sabotaging in the long-run and dependent on the success of the altruist or the tribalist. Meanwhile, once introduced into the environment, the tribalist would supplant the altruist as the dominant unit. This is a crude oversimplification of a basic principle; trust in others, help others, be wary of psychopaths and greedy gluttons, and you will have a superior outcome to if you walked alone