Ser Clegana beat me to it, also, there are homophobes and other issues, so it isn't just islam at all.
Islamophobe experienced its main rise after 11/9. Especially due to the propaganda and war-mongering of serveral western nations. This has lead to an irrational hatred and fear of islam. So people are scared of a woman in a burka walking down the street, as she might be packing C4 underneath, etc.
It isn't to silence criticism, it is simply a real issue of people with serious issues.
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