The United States was making large sacrifices because were fighting in two theaters (Atlantic/Europe, and Pacific
And the British weren't?
Just how many US cities were bombed with 3-400 plane raids and how many US citizens were killed in these raids?
The Germans started with bombing cities with a mix of HE and incendieries in WW1 , they continued at Guernica, then Rotterdam etc in WW2 then the blitz attacks on London, Coventry, Birmingham, Liverpool, Glasgow , Belfast etc even neutral Dublin ,possibly a mistake but a 100mile navagation error
Nazi germany got everthing it deserved, if the war in Europe had continued a couple of German cities would have been turned into glass carparks ,possibly by B-29s flying from Northern Ireland.