Why do people haft to be diffrent?

Question: Why do people haft to be diffrent?
- Keywords:
  human,
  philosophy,
  society
Asked by chealsea123 to Joe on 11 Mar 2014.
- Joe Sweeney answered on 11 Mar 2014:
  
  It’s because mixing things up often makes things better. When people’s characteristics are mixed, they are usually more able to survive problems (like illness) and are stronger. This is how evolution works.

Question: Why do people haft to be diffrent?