Of course it served.
Aha, you mean that germans just killed them for fun or because they are "evil" or something like that?
Of course Allies would never do that.

Like for...revenge example or show the "yellows or nazis a lesson"?
Partly Germans killed them because they wanted to inspire fear and break the morale of allied troops.
Is that reason enough or do you want to continue blah-blah how killing huge patch civilians who have no way of saving/surrendering themselves isn't warcrime but killing few soldiers whose side firebombs their cities is?
Yeah, but of course allied soldiers in the Bulge aren't part of any warmachinery, right?
What do you suggest a man/woman/child in Tokyo would do when he lives there and his government is in the war against US? Stop working on the factory? He/she can die anyway in the firebombing?
Please, I want to hear how you "justify" such acts and crimes against humanity.
Like I wouldn't know that and I saw that coming miles away.
Would you enlighten me why you consider it necessary to the point that it can be erased as warcrime?
What allied doings in WWII to you constitute as warcrime and why?
Or do you think that if americans would have killed lots of japanese POWs it would have been warcrime but firebombing not?
The firebombing was wanton destruction alright. You can forget that "not justified" there since it's the winners that make those rulings after all. If we cannot make our own mind about that now, then we are as screwed as the nazis were.
Firebombing of Tokyo is a warcrime because it was an overkill when considering the purpose and jeopardised the lives of thousands of civilians who probably wanted have anything to do with the war. Many of them hadn't any choice and some of them even probably wanted to surrender just like those soldiers in Malmedy.
They are both outrageous warcrimes and crimes against humanity or otherwise we can clear up "warcrimes" entirely from our wordbooks and this all talk is rather absurd.