"The need for enemies seems to be a common
historical factor.
States have striven to overcome domestic
failure and internal contradictions by designating external
enemies...
Bring the divided nation together to face an outside
enemy, either a real one or else one invented for the purpose."
"The sudden absence of traditional adversaries has left
governments and public opinion with a great void.
New enemies,
therefore, have to be identified."
"In searching for a new enemy to unite us, we came up with the
idea that pollution, the threat of global warming, water
shortages, famine and the like would fit the bill.
All these
dangers are caused by 'human intervention' and it is only through
changed attitudes and behavior that they can be overcome."
"The real enemy, then, is humanity itself."
Source