“the silence on the part of the other 99.9999%”
I would say that most Muslims actively support the terrorists. When asked under conditions where they do not need to lie as is their habit, they seem to almost always speak in support. The silent Muslims with reservations might be 10%. Maybe less. The peaceful Muslim is one who is not really an adherent, too stupid to know what they have bought into, or a liar.
I never see opposition from any Muslims, and those that have “fallen away” can be the most dangerous when trying to prove their zeal to the hard-core killers.