The necessary condition 2

Lack of compassion is a mental illness which is a bit more devastating than most physical illnesses. The present most recent illness - the swine flue - has caused some 6 000 deaths so far globally. The lack of compassion has caused millions and millions of deaths in wars and conflicts.

The problem with lack of compassion is that it starts anew with every new generation. It can not be erased once and for all. But the situation is better now than it used to be only one hundred years ago. It can be much better.

Low level lack of compassion is tolerated in most cultures. Hostility, negativity and envy is often considered good as social control and a way for keeping the population alert. 

To live in this acid environment is not nice or fruitful, however.
Lack of compassion causes frictions and conflicts, and in order to stop these effects more friction and violence is used - by military, police or private gangs.

The better way would be to stop the mental illness as a mental illness. It is a question of awareness. No medicines are necessary.