Also, the city of Dreden was not "just full of refugees". Many of what we call refugees now, were soldiers at the time being reprovisioned there. As has been pointed out on this thread, in February 1945 Dresden was a significant military target in the Eastern front and played in to rolling up both fronts by destroying the Nazis ability to move men and material between east and west.
It was a horrific fire strom that it produced that did kill many, many civilians...but it, once again, crushed the will of the population of the German people as well as their military.
It was a horrific result of the all out war World War II was...and in my estimation, it was a necessary punctuation on the will of the allies to crush the will and capability of a bitter and ruthless enemy and her people.