RAM, your argument is flawed for 2 reasons.
1 Almost every legal system allows you to use any reasonable force defending yourself, including lethal force if you are faced with a threat. A woman is allowed to shoot or stab a rapist, if that is the only way to stop him. A man is allowed to fight back to the limit of his abilities, if h is attacked. If you believe the person you have just knocked to the ground will gt up and attack again, you are allowed to keep kicking him on the ground until you are sure he can't get up again.
2 To suggest the Allied response was an escalation of the German's is wrong. Who killed more civillians during the war? Germany, by a vast amount. I am not saying because they killed so many they deserved it, but the allied bombings were not an escalation, they were much smaller in scale than Germanies attacks.
The allies bombing attacks were designed to destroy the German economy, and towards the end they succeeded. In doing so they killed around 500,000 Germans, mainly civillians.
The Holocaust was designed to kill anyone who didn't meet German racial standards. It didn't help the German war effort, rather it hindered and cost the Germans a lot in lost production, partisan attacks etc. It resulted in the deaths of over 10,000,000 civillians.
Now tell me how that was a case of the Allies going over the top in their reaction.