War.

For the sake of killing off anyone who disagrees with our thinking.
We are close-minded, stubbornly refusing to listen to another opinion.
There is no such thing as another opinion, only ours - ours to make, ours to do, ours is RIGHT.

“Who dares to protest?” a man bellowed. The room was silent, knowing that any voice against him would be shattered.

Ours is right.
why?

because everyone in OUR meeting says so: Me, me, I, myself, we, our, MY meeting!

“You were there,” the old man points his index finger to the north direction. “And you too,” he turns and points in another direction, “and I was there.” The faces all gave identical nods in return. 

The house was surrounded by walls, walls that had mirrors from the ceiling to the ground. A single armed chair was placed in the middle where the man sat. There was only one window in the whole room. One source of light.