Why so Sterotypical?

I believe humanity as a whole likes or naturally points out physical characteristics even personality traits and habits.Society likes to create international stereotypes to classify the different races such as Asians then substerotypes such as Vietnamese, Korean etc... Becuase people use it to base a judgment on that person by the way they look when in fact they may be the complete opposite of what you think. Humanity likes to take the easy way, so they separate from each other. A difference which can  often lead to  to conflict  such as the Holocaust in Uganda, and Hilters Holocaust which they targeted certain traits of the race ex. large noses= Jew in the Nazi eye's, the event also spawned a stereotype that if your German your a Nazi.