The nazis felt free to kill subhumans because they were "lesser races." Great swaths of propaganda demonstrating the genetic and physiological inferiority of jews was used to justify their mistreatment.
Israel does the same and claims it as a privilege. Their fellow travelers in the media call it a "controversial" issue. It's not controversial.
Breaking the first commandment is a sin. It's one of the most terrible of all the sins. People who think the first commandment doesn't apply to them are damned. They may have been born damned.
In wartime the only legitimate target is soldiers on the other side. Any army that targets civilians for any reason should be brought to justice and tried as war criminals. Anything else is madness.