Imagine we live in a society where humans are completely open-minded and rational about everything. They reason logically and are willing to debate to reach a consensus.
However, even their ultimate motivation is only benefit to themselves, just like us. They too have qualities like us that could potentially be weaknesses, such as hatred, love, fear, etc. but in a more limited extent.
This means that they will make faster communication and better decisions with people when they want to, and be extremely deceptive when they know that their will is against their opponent. This, however, can be brought to light by others more easily. All people know that it is better to get educated.
Would such a society develop in a similar, but faster fashion as ours? Or will the accountability of the political leaders cause them to maybe become pawns at the hands of the people, or will rulers take over nations by force, since deceiving them doesn't work out?
I would like to clarify what I mean about open-mindedness and rationality.
Open-mindedness just means that people will be willing to consider all options (privately, at least) and be more logical in what they think. For example, a Muslim will be willing to consider why his faith could be wrong, rather than just blindly following it. This doesn't mean that the whole world will be following one religion, but study of everything will be more organised.
'Their ultimate motivation is to benefit themselves' doesn't mean they are necessarily selfish. It means that their basic psychology is like ours. For example, if someone feels that they should sacrifice something of their own, in favor of someone they pity, love, etc., that is fine, because the satisfaction they get from helping the other person 'benefits' them. Similarly, there could be a guy who feels no emotions for others and only believes in personal profit, and to fulfill this goal, it might be the best decision logically to even kill someone.
And about feelings co-existing with rationality,.. You could hate someone because you feel they have worked against your purpose in life. However, you are not going to shout at them, fight with them, etc. in a fit of rage, you will first logically think as to whether this is going to, in any way, benefit your pursuit of your purpose in life. If the logical answer is 'yes', you can proceed. And by fear, I meant logical fear. One could be afraid of circumstances and fear for his life, but he will continue to take rational, open-minded decisions to ensure his survival.
Therefore, feelings will be in 'a more limited extent'. What I mean to say is that the purpose of one's life is undefined. All kinds of people will exist. This won't be a perfect society, just a slightly better one than ours.
I am asking how they will progress from a political point of view. Would kingdoms have existed? What would cause leaders to wage war, and what would the people do? What kind of models of government would have been popular? Will terrorist groups exist, and how would they operate? Will the psychology of the military play a more important role, since they know that the government relies on their united support, to retain a model of government?