It's not the fact that we are killing Muslim terrorists that upsets Muslims so much, it's that we're making it look so easy.
Which great Israeli general said the key to victory is to fight Arabs?
As Moshe Dayan once remarked, on being praised for his success in the Yom Kippur and 6 Days' wars:
'I just did my duty. Of course, it helps if one can arrange to fight Arabs.'