Why did the Nazis persecute certain groups?

• Also the same answer can be given to "Did the Nazis only persecute the Jews?".
• Hitler believed in the Darwin theory of evolution that stronger people live and weaker die.
• Hitler felt that Aryans were the master race and often blamed other groups for losing the war.
• The unhealthy, disabled, and tramps were seen as worthless and expensive.
• Alcoholics, prostitutes etc were seen as undesirables.
• Hitler didn't like gypsies and they too were persecuted as they didn't work.
• Jews - got good jobs, Germans were jealous, successful commerce, not pure German were all reasons why Hitler persecuted Jews.