Deprivation

To some extend, we all believe that each and every one of us, is deprived of something. Why? Simply because our world is so full of options and diversity, we think we can have it all. We know we can't, but deep inside, we know we "need".
I think that this is one of the main reasons, humans seek the company of each other. Because everyone of us is "deprived" of something different. One may lack self-confidence, self-control, self-esteem, or self value. Or even simpler things, like material funds, sleep, or a sufficient taste in art. But in the end, we all come looking for each other on smoke breaks at work, bars, and even grocery-store lines.
But of course, if one claims to be deprived of a thing he thinks is rightfully he's, he probably must possess, at least, a thing or to to compensate. Say, a man who believes he has a small penis, is more likely to buy a "Hammer" SUV. A man with low self-confidence, will try to compensate with a strong sense of humor. While the man with high self-confidence, won't have one. So... what reasons brings us together? I see two:

1. Fear
People with the fear of those, who have these things they lack. They seek-out other people, with the same issues as them, for support. This, of course, makes their opinions towards those who are "not deprived" more radical, and they small, well bonded, hostile extremist groups.

2. Faith
As much as I have none of it on words, I think I operate by it, to some extend. And not only me.
This group of people, seeks those who have what they, themselves, are "deprived" of. Why? In faith that the other side will share their possessed advantages, while exposing their flaws, for a fair exchange of interaction (Some thing like "Show me yours, I'll show you mine", thing). There is a higher chance of getting hurt, but there is no exposure without risk. If it goes good, on the other side, you come out of in a more round and balanced person.
It's nice to be one, for a change.

So, the more perfect you show yourself to be, the less people will want your company. Group 1, will just fear you. Group 2, wouldn't want to open-up, because, you won't.

Perfection, has it's flaws. But flaws, lead to perfection.