Why did Adolf Hitler kill millions of people?

Adolf Hitler didn't kill anyone he killed Jews, Homosexuals, POWs, Communist, Physically disable people, deaf people, gypsies, priests and children

He did all of this because they was Non Aryan and they wasn't German.

Hitler described Aryan people to be tall, handsome, blond haired, blue eyes, strong. athletic and white.

Hitler wanted an aryan race, thats why he invaded Poland and Czechoslovakia because they wernt german and aryan people