What are the two central themes?

When violence becomes too common, some people no longer take it seriously.

Pride in one’s country makes people feel superior to others based on race.

The power of love will save people from hurting and harming others.

Nature provides everything humanity needs and therefore anything else is wasteful.

Humankind’s place in nature is to act with reason, not to become like violent animals.

The cost of technology is the cost of human life in war.