This is exactly what would happen now if we should be seen to be the first to quit in Saigon.

Experience shows us that we must not rush to leave a country that has just seen the end of a conflict and simply turn our backs on the whole situation.

And so the process began and they said, You can't put it all on an island some of it has to be on the mainland because we don't want to turn our back to the community.

Suddenly, we humans, a recently arrived species no longer subject to the checks and balances inherent in nature, have grown in population, technology and intelligence to a position of terrible power.