Maybe for the same reason that most non-muslims don't take up arms against muslims, or even criticize it.
Yup.
There are ≈1.3 billion møøselimbs on the planet.
Our very survival requires that we kill n møøselimbs. Where n is a number between 0 and 1.3 billion. It is defined as the number necessary to kill for the remainder, 1,300,000,000-n to forswear violence as a means of religious debate.
WE don't set the value of n.
THEY set the value of n...