Assalamu alaykum
One must know that even the Allied forces partook in killing innocents. The Nazis were not the only people committing war crimes and atrocities. Because the victor gets to shape the outcome of history, we only hear about the Germans and the Nazis. The British bombed many cities in Germany, often there were revenge attacks and civillian targets were deliberately hit.
"The first raids were on Lubeck and Rostock. Here the bombers dropped incendiary bombs and these raids did a great deal of material damage to both cities. In May 1942, a massive 1000 bomber raid on Cologne, did vast damage to the city for the loss of just 40 planes. Such a small rate of loss was considered extremely good especially when the government took into account the 'feel good' factor of the raid - the boost it gave to Britain's civilians knowing that Germany was being bombed just as London had.
With such apparent success, the massive bombing raids continued on cities such as Hamburg and Berlin. The raids, which the Nazis referred to as "terror raids", culminated in the infamous raid on Dresden in February 1945."
Source:
http://www.historylearningsite.co.uk/air_marshall_arthur_harris.htm
In four raids between 13 and 15 February 1945, 722 heavy bombers of the British Royal Air Force (RAF) and 527 of the United States Army Air Forces (USAAF) dropped more than 3,900 tons of high-explosivebombs and incendiary devices on the city.[1] The resulting firestorm destroyed 40 square kilometres (15 square miles)[citation needed] of the city centre. Between 22,700 and 25,000 people were killed.
In 1945, Churchill told Arthur Bomber Harris (who was the Marshal of the RAF): "It seems to me that the moment has come when the question of bombing German cities simply
for the sake of increasing the terror, should be reviewed. Otherwise, we shall come into control of an utterly ruined land."
Similarly, during the 1920s Iraq was attacked and many civillians killed with the use of chemical weapons. The British would fly over villages and dump chemicals over terrified men, women and children. Soldiers would go through villages shooting civillians. They did this because the Iraqi people wanted independence from the British who occupied Iraq. These attacks killed tens of thousands of civillians.
In fact, even with the Allied stories, we only hear about the White European / Americans as being the saviours of humanity.
There were Blacks and Asian Muslims involved in the First and Second World Wars. There are stories of unsung war heroes who helped save lives and fought against the Nazis.
So given all this, I think yes the Nazis should pay for their crimes, but it is sad that others in the conflict are given a total free pass, with absolutely no inspection of the "terror" they committed.