People who decry the fact that businesses are in business "just to make money" seldom understand the implications of what they are saying. You make money by doing what other people want, not what you want.
The success of diplomacy lies in truly understanding the needs and interests of the other party, and seeking possibilities for cooperation based on that understanding.
Diplomats should have the ability to respect and understand other countries and cultures, as well as the ability to communicate across language and cultural barriers.