And you never, ever, hear "good" Muslims stepping up to condemn these atrocities.
First off- to be a 'good' Muslim you must obey the dictates of the 'religion'. That is precisely what the terrorists are doing. They ARE the 'good' Muslims. To condemn them, or their actions, is to condemn the 'commandments' of Islam.
Persecute, destroy, and kill 'infidels' unless they are subjugated. That is in the Koran. That is the core of their beliefs.
To condemn terror and murder is to condemn Islam's modus operandi.