Breed

"Wherever you are now, whatever you are doing now, chances are you are dead then. Because then is not now, and then is different. Then is a different lifestyle, a different world, a different system. And if you survive, you are different from who you are now. Then changes you wholly, completely, absolutely. Now is not then, and then is not now. I must ask you to keep that in mind."

Somewhere, in a future, lies the possibly last remaining society on earth. Within this society lies two peoples: the Thrivers, and the Wallowers. Engineered by a brain chip, both of these peoples have become victim to different types of thought, separated by a system.
In the Wallower community, the people are productive, innovative, and successful. They have nearly wiped out every infectious disease known to man, have made outstanding technological advancements, and increased the standard of living far beyond thought. However, they lack free thought, obeying every instruction given to them.
On the other side, Thrivers are selfish, carefree, and wild. They seek thrill and happiness, enjoying all life has to offer. However, they also lack their own form of thought. The wiring of their brain forces them to become extremely selfish and lazy, living of the products of those Wallowers.
At first, the brain chip causing this separation had to be manually implanted, but over time it became an extra code in the genome of the human body. Wallowers and Thrivers pass down their way of thought to their children. But over time, the power of this gene began to wear down, causing a recessive trait to enter the chromosome: free thought.
When children inherit this unbridled form of thought, they don't want to conform to a lifetime of obedience or laziness. Eventually, the leaders were forced to come up with a solution on how to make them fit in.