Is America still fighting Nazis and Imperial Japanese? Didn’t killing them just make more of them?
I would say one difference is that Nazis and Imperial Japanese were confined to one country.
Muslims are everywhere.
We killed enough of them, and they stopped fighting.
A worked example of the LeMay proposition.
BTW, genocide was most definitely on the table, especially with reference to the Japanese. Fortunately for us, we did not need to take things that far.