Clubs

You are like me.
I like you.  
I like you enough that I'd like to spend time with you.  
This thing we share is fun or important or special.
We should rally together and promote this thing we share.
If you feel threatened or need help in life's day to day struggles, I'm here for you.

Above are the ways tribes, clubs, and social groups begin.  Being a part of a group binds us together, gives us a sense of belonging, and enriches our lives.

We are right.
They are wrong.
Their beliefs threaten ours. 
They are others, they don't belong.
We should change their minds or intimidate them, they are a threat.

And so a tragedy begins.  Many groups start because a minority or individual is persecuted or made to feel as an outsider by the majority.  How sad when it turns and they perpetuate the wrong that brought them together.