I'm saying killing all Muslims is impractical. Why didn't we genocide the Japanese in WWII? There are some parallels between how we felt about them and their code of Bushido after Pearl Harbor to how we feel about radical Muslims today.
If not for the atomic bomb, we might have been forced to pretty much do that. The Emperor, Hirohito, decided to surrender rather than lose his people wholesale. He's probably the only one who could have ordered them to surrender, and not been immediately killed. Being thought a god has it's advantages.
In the event, the final battle(s) against the Germans were much more vicious than those against the Japanese. Especially in the East, between the Russians and the Germans. The Germans were still fighting when the writ of the Third Reich covered only about a 2 X 7 mile area surrounding the Hitler Bunker.
By final battles, I mean those leading directly to surrender. In effect in Japan, there no final battles, they decided they'd had enough *before* we had to invade their homeland. (Laying aside that Okinawa and Iwo Jima are technically part of Japan).