I find this type of argument extremely un-helpful in understanding Islam and the worldwide violence that continually follows it. The suggestion that because most Moslems do not act violently does not mean Islam itself doesnt support violence this is a non sequitur because there is an inherent disconnect at work here. A widely held belief or practice does not guarantee the belief or practice to be correct.
It is not difficult to envisage that many Moslems may actually agree with acts of violence but may not wish to partake in these acts themselves for a number of reasons such as the sacrifices required, the punishment they will receive for breaking the law or having other priorities such as their work, raising a family etc. Just upping sticks to join groups like ISIS is easier said than done. See, we know that most Moslems accept Islam permits polygamy for instance, however most do not undertake it due to various reasons. So we see that an absence of a given behavior cannot determine what Islam permits and does not permit and just because most Moslems subscribe to baseline human behaviour of not wishing to kill people does not mean those people do not share the end goals of those that do engage in violence or that they see such violence as justifiable.
Indeed, we know this to be true because this exact thing has been shown time and time again with study after study showing that whilst technically a minority, many many Moslems support Islamism. For example, a Gallup poll, the largest ever conducted on Moslems, used a scale of 1 5. 1 = Moslems thought the 9/11 attacks were completely unjustified, 5 = Moslems thought the attacks were completely justified. 7% were 5s which, if we extrapolate this to 1.6 billion means 80 million Moslems thought 9/11 was justified! But more worryingly, only 63% were 1s which means that 37% of Moslems thought that 9/11 & similar attacks were in some way JUSTIFIED! 37% of 1.6 billion = 592 million Moslems!!!
Islamic extremism has the support of millions of Moslems make no mistake about it and this helps explain why we see the same thing again and again. Those that say these extremists are pushing there own narrative and not those found in Islams divine texts never can explain that all these Jihadists the world over have pretty much the same goal establishing Islamic rule in accordance with the fundamental prescriptions of the faith. This fact is always lost on people that whether the extremism is in Africa, the Middle East or Asia it always looks the same as is their world view.
The moderate Moslem offers me no comfort for the facts are that in 1400 years they have never dealt with this minority' and history tells us it is always the extreme fraction which dictates the agenda - it is the proverbial 'tail that wags the dog'. Do I think all Moslems are violent? Clearly not, but my argument is this doesnt mean Islam itself does not allow for violence and that ultimately it is not really helpful anyway. Did the moderate Moslem make any difference to the formation of ISIS, will they be the ones to stop it? Do they make any difference to all those literally thousands and thousands continually being slaughtered the world over each and every year in the name of Islam? No they dont, they never have and I am trying to understand why.