Evolutionary theory has nothing to say, in general, as to whether cheating is more advantageous than cooperating. There are many circumstances in which the contrary would be true, and empirical evidence, though it exists, has little bearing on real situations.

In 1961, the United States began chemical warfare in Vietnam, South Vietnam, chemical warfare to destroy crops and livestock. That went on for seven years. The level of poison - they used the most extreme carcinogen known: dioxin. And this went on for years.

The major advances in speed of communication and ability to interact took place more than a century ago. The shift from sailing ships to telegraph was far more radical than that from telephone to email!

Independent development can be a virus that can infect others.

On nuclear war, actions in Syria and at the Russian border raise very serious threats of confrontation that might trigger war, an unthinkable prospect. Furthermore, Trump's pursuit of Obama's programs of modernization of the nuclear forces poses extraordinary dangers. As we have recently learned, the modernized U.S. nuclear force is seriously fraying the slender thread on which survival is suspended.

They, students have a degree of freedom that nobody else has.

I grew up in that, when I was a kid. My friends and I used to play cowboys and Indians. We were cowboys killing the Indians, following the Wild West stories. All of this combined into a very strange culture, which is frightened.