A sense of trust allows us to connect with people and share intimacy of thought, which is key to happiness.
Most people are so closed that it bothers me; such as when I talk to a little girl and she does not answer, feeling awkward or hesitant likely due to the conditioning of her parents and friends about not talking to strangers or worse, being afraid of pedophiles. Such closed people may never be harmed by another person in their lifetimes, but they are certainly harming themselves on an ongoing basis, like dying a slow, painful death in anticipation of one’s death, rather than living one’s life to the fullest for however long one has to live. However people don’t realize this and spend their lives in pursuit of one special relationship with a significant other, to the exclusion of people at large, and then wonder why they feel lonely and disconnected in the absence of that one person.
People who are uninhibited spread joy to others who are similarly open to connecting with people. Beyond an open mind, radiate a warmth; initiate or respond with a smile, wave, handshake, hug or conversation; all work wonders to make us happy as a collective.