And you think the rest of us don't interact with people of this community? I've known a few muslims (mainly ismailis, shiites and ahmedis) who are nationalists.
By Islam's definition, such people are heretics as they don't spread Islam by any means. So while they may appear muslim by name to us, they are traitors by the definition of their own religion.
You tell me, then what to do?
Here is something you want to see.
Google each of these rape/attack/riot causes and see it yourself. I researched this stuff before forming an outlook.
See for yourself.
If you're the brother of any of these girls raped and you retaliated and instead of supporting you if others used religion as the excuse, tell me what will you do after your sister's life is destroyed?