There is such a missed point here.
If 90% of the terrorism in the world today is done by muslims , or for the sake of arguement if only 5o% were this is enough dispurportion to require examination.
If ANY(even just one) terrorist when asked the "why?" question says it is to benefit Islam, then this becomes worthy of further investigation .
In a world in which preachers of Islam are more prone to blame the problems of their homeland and their faith ,on foreign influences than on anything elese , even if this preaching population is only a strong minority then this becomes a question worthy of intense inquiry.
It is worthwile to preserve the safety and the clean reputation of the innocent , even the innocent that share some caricteristic with the guilty, ....BUT not to the politicly correct extreme at which the caricteristics that the guilty share together cannot be examined at all simply because some innocent also have the same caricteristic.
It is as if someone discovered that 80% of assissians had big hands , and could not ever say so because he had to protect the set of people with big hands who were innocents.
It is only the careless use of false syllogism that we need to avoid , not the real facts as they are.
[Yes my hands are rather small.]