Or people are scared because they understand it all too well.
You seem toi imply that critical attitude towards islam must be equated with prejudice, that'S how I got oyur last paragraph. Actually, that statement is a prejudice of yours in itself - against people criticising islam.
and to answer your question, yes, I knew and knwo Muslim people. And some where like you described. Others were of the like I - and others - attack them for. Most living in the West, however, form a silent, never caring majority that is sticking to itself and isolates itself as best as it can, and that is not just my subjective imoression and personal experience, but that is data from various sociological reasearches on these matters, the latest in Germany has been published just ten days ago. All this is not a very constructive way to try integrating oneself into a new living place one has moved to.