They just cause problems everywhere they go. Even the Christians in the US don't cry about shit as much as Muslims do. Gay marriage and abortion are big subjects, but that's really about it that people are for the aforementioned can say "stupid Christian fundamentalist....."
Maybe because my parents and people from Asia, in general, have had experience with them. The really bad ones. Their countries' history has been shaped by them, and a lot of times it's because of conflicts with the Muslims.
We talk about Islamic states today and we see them as "backwards" and just "fucked up" in general. But Muslim civilizations thousands of years ago were prosperous and seemed to work well. They were smart as shit, especially the Persians. The East in general is responsible for furthering advancements in agriculture, math, science, whatever. So what happened in between that they went to shit and others prospered? I don't want to hear it being religion being the reason for holding it back. I mean, it is, but that's not the ideals of the religion's fault; I think it's the way the people just manipulated it to fit their needs. I think that's what ruined it.
You can still have your no pork, alcohol, pray five times shit. But it's starting to seep into other parts of the world, which is fine too, but there are extremists that are forcing non-Muslims to cater to Muslim needs. And that's where the problems start, especially in Europe.
There are two groups of people that no matter where you go in the world, there are many people that will have strong negative opinions on them. Muslims and blacks. And for the latter, maybe African Americans, and not just any type of African (from Africa). I know this first hand. I go to a school with plenty of Muslims. And they're a mix from India/Pakistan, as well as Iran and other Middle Eastern countries, like Egypt and Palestine. We also have plenty of people from Africa as well. Nigerians, South Africans, Ghana, etc. They all have experiences with Muslims. And they'll confide to non-Muslims that while the ones here are rather modest and not dicks, back in their countries, they are ruthless. There are even some Nigerian muslims here. And they get along fine with each other.... but there's always that thought/understanding of what Muslims have caused in the past for their ancestors, and even in present day.
That doesn't just happen through spreading rumors and stereotypes to elicit fear of them. There's a rich history of it.