We can't overcome loneliness by ourselves. We need someone else to overcome our loneliness. And we need to trust someone else to overcome our loneliness.
Unfortunately when we are lonely, we start to loose our social skills, and so meeting and greeting becomes a negative experience. And so in our loneliness we start to avoid social occasions. But worse, we start to think we can overcome the pain of our loneliness by ourselves, but it only makes it worse.
We think that by being in control we will be OK, but trusting someone else means letting go of control to a significant degree.
Also finding a friend to trust is also a matter of luck. So the more we meet and greet, the more we increase our chances of meeting someone to trust and so end our loneliness.