Some are thier to study and they go back home again. Some are there because they can not go back home(not allowed) as in immigrants case. Some were born there as Muslims or EU citizens who converted to Islam and thus that European country where they born is thier homeland, but they still disagree and hate what thier government is doing to thier fellow muslim brothers in thier countries.

So, dont tell me that why dont they go back. Normally, anyone who does not like the place where he is will go back to the place where he likes.

You don't like what extermists are doing and thier beliefs, but you are here sitting in thier country and surrounded by them. Why don't you go back to your country?hm?