Trust is a complex emotion, an integration of sorts of all the various emotions that are much easily felt like happiness, sorrow, anger etc. Trust is not felt directly but in an indirect fashion. If you can open your emotions in front of another person, you show trust. Then again, what you show establishes the level of trust. On one end of the spectrum is the 'social' aspect of trust where you maintain a guard about what you speak and what you don't. On the other end of spectrum is the place where you keep your head on someone's lap and get irritated because you did lousiest of mistakes and can blame no one. We all lie in between this. Complete trust is difficult to achieve because at times even we are not sure about our emotions.
Trust always makes things positive. If you trust someone, you bring out your negative energy and try to make sense out of it. There is a biological aspect and physical aspect of it. They both can be summed up as follows - your mind has a tendency to go to lowest energy state. The biological aspect is simple - rest now to save energy for tomorrow's disasters. The physical aspect is linked to electron theory of Bohr. Summing up, your brain will try to simplify things as fast as possible, provided it sees that it can come back to a state of rest. If you are with someone you can trust, thoughts ease out and clarity comes faster. Conversely, people who have the most clarity, trust their instincts to be relied upon in absence of any adversary.
Amount of Trust in a society directly affects state of society. As the quanta of trust increases, it means that more and more people achieve a peace of mind which leads to less restlessness and hence less aggression, less violence and a peaceful society. The converse is also true that in a peaceful society, more people will tend to trust each other than societies that are unstable in nature. Volatility in societies are largely hereditary. Ultimately body does what it needs to do in order to survive in an extreme condition. Although, when things get better, we don't break that habit and worse pass it on for generations together. Clans and tribes still exist, even though I am writing this blog over internet.
Information has a direct implication on trust because the more dialogs happen in a society, more trustful it becomes. This can be directly extrapolated from how one human trusts another. It is a positive spiral. One thing that information technology has provided is easy access to information that can be accessed from anywhere. We have telecommunication revolution of sorts going on and Google has opened doors for billions of people to transmit their thoughts. And yet, Iran is going against IAEA support to build Nuclear Enrichment plants. Why?
Because even though information is exchanged, we are still in that same genetic makeup of self survival. All information exchange wants to happen to ensure that personal benefits take precedence. While that'd have been good if personal benefit has a correlation with societal benefit though it turns out that Power and Trust don't go hand in hand.
The choice that every human has to make is this - do I choose to trust or do I want to make sure I am in control? Now I don't say it's bad to have control, all I say is control yourself because when you start controlling anything other than yourself, you start losing trust.