Wrong. So very wrong. Diversity of opinion is what led to the formation of the United States of America.
You think our Founding Fathers agreed on everything? If you do then your ignorance knows no bounds.
Diversity of thought yields better ideas and inventions. Disagreements are the seeds for better societies. Debate and argument provoke anger.... But also new thoughts, ideas and creativity.
The best rock bands had the most internal fights. Ask Van Halen, the Beetles, and the Stones about that.
No good marriage wasn't built on disagreement and compromise.
No great business is built on groupthink.
Diversity of foods, clothes, music, thought, race, and religion is the spark for the flame of Democracy we are.
Look no further than China, Russia, Iran and North Korea to see the dead end economies that result from zero diversity and groupthink. 90 percent of China's economic success is tied to stealing our ideas, copying our formula and selling their junk to our thriving economy.
Diversity is the main reason for why we are a great nation...period.