I don't think it wrong to question why certain things reoccur in some demographics, or religions for that matter. My mother an avid Catholic found it hard to come to terms with the historical level of abuse in the church, a church that meant so much to her. Abuse conducted so covertly that she and others like her would never have known it existed. Nevertheless, exist it does when we read of late that there were 300 priests involved in sexual abuse in Pennsylvania alone That's a hell of a lot for one state!
Similarly when the numerous cases come to light, of sexual grooming, mainly carried out by one ethnicity again and again, like the abuses by priests, it's not unnatural to think is this ever going to end, and is it still going on? It's not unreasonable to contemplate that when such abuses occur on an industrial scale, possibly there is something wrong with the culture that the abusers are immersed in. Whether it's trying to sweep wrong doings under the carpet as has been the way of the Catholic church or denying the grooming of young women, children even, by gangs is criminal and only highlights the deep injustice metered out to those victims who suffer twice. Not unnaturally, people really, really hate cover ups in the name of political correctness and this will be a factor used against certain communities, in spite of all those brave Muslims who have the guts to condemn the abuse.
Similarly, when there is an atrocious terrorist campaign that kills and maims umpteen, I think people get sick of the likes of Cameron (in particular) and their meaningless never ending platitudes along the lines of "this is nothing to do with Islam" when clearly it is, or indeed a version of it. It's tantamount to saying The Inquisition was nothing to do with Catholicism.
When discussing Islamophobia which exists throughout Europe, it's nonsensical to omit some of the mitigating factors that play into that. I think it occurs to a lot us, when we read how random some of the worst atrocities are, that could be us, or our nearest and dearest and no we can't all stand together, another platitude, if we are blown of the face of the earth by some of our fellow citizens !