Germans were eager to go through whole meatgrinder of Eastern front losing hundred of thousands of soldiers there and did not even flinched after firebombing of

Germans were eager to go through whole meatgrinder of Eastern front losing hundred of thousands of soldiers there and did not even flinched after firebombing of Hamburg. What is the difference from 30kT nuke? Nuclear weapons in 1930s would made war more destructive, but it would happened anyway.